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+# CHANGELOG
+
+## 1.4.2 - 2017-03-20
+
+* Reverted BC break to `Uri::resolve` and `Uri::removeDotSegments` by removing 
+  calls to `trigger_error` when deprecated methods are invoked.
+
+## 1.4.1 - 2017-02-27
+
+* Reverted BC break by reintroducing behavior to automagically fix a URI with a
+  relative path and an authority by adding a leading slash to the path. It's only
+  deprecated now.
+* Added triggering of silenced deprecation warnings.
+
+## 1.4.0 - 2017-02-21
+
+* Fix `Stream::read` when length parameter <= 0.
+* `copy_to_stream` reads bytes in chunks instead of `maxLen` into memory.
+* Fix `ServerRequest::getUriFromGlobals` when `Host` header contains port.
+* Ensure `ServerRequest::getUriFromGlobals` returns a URI in absolute form.
+* Allow `parse_response` to parse a response without delimiting space and reason.
+* Ensure each URI modification results in a valid URI according to PSR-7 discussions.
+  Invalid modifications will throw an exception instead of returning a wrong URI or
+  doing some magic.
+  - `(new Uri)->withPath('foo')->withHost('example.com')` will throw an exception
+    because the path of a URI with an authority must start with a slash "/" or be empty
+  - `(new Uri())->withScheme('http')` will return `'http://localhost'`
+* Fix compatibility of URIs with `file` scheme and empty host.
+* Added common URI utility methods based on RFC 3986 (see documentation in the readme):
+  - `Uri::isDefaultPort`
+  - `Uri::isAbsolute`
+  - `Uri::isNetworkPathReference`
+  - `Uri::isAbsolutePathReference`
+  - `Uri::isRelativePathReference`
+  - `Uri::isSameDocumentReference`
+  - `Uri::composeComponents`
+  - `UriNormalizer::normalize`
+  - `UriNormalizer::isEquivalent`
+  - `UriResolver::relativize`
+* Deprecated `Uri::resolve` in favor of `UriResolver::resolve`
+* Deprecated `Uri::removeDotSegments` in favor of `UriResolver::removeDotSegments`
+
+## 1.3.1 - 2016-06-25
+
+* Fix `Uri::__toString` for network path references, e.g. `//example.org`.
+* Fix missing lowercase normalization for host.
+* Fix handling of URI components in case they are `'0'` in a lot of places,
+  e.g. as a user info password.
+* Fix `Uri::withAddedHeader` to correctly merge headers with different case.
+* Fix trimming of header values in `Uri::withAddedHeader`. Header values may
+  be surrounded by whitespace which should be ignored according to RFC 7230
+  Section 3.2.4. This does not apply to header names.
+* Fix `Uri::withAddedHeader` with an array of header values.
+* Fix `Uri::resolve` when base path has no slash and handling of fragment.
+* Fix handling of encoding in `Uri::with(out)QueryValue` so one can pass the
+  key/value both in encoded as well as decoded form to those methods. This is
+  consistent with withPath, withQuery etc.
+* Fix `ServerRequest::withoutAttribute` when attribute value is null.
+
+## 1.3.0 - 2016-04-13
+
+* Added remaining interfaces needed for full PSR7 compatibility
+  (ServerRequestInterface, UploadedFileInterface, etc.).
+* Added support for stream_for from scalars.
+* Can now extend Uri.
+* Fixed a bug in validating request methods by making it more permissive.
+
+## 1.2.3 - 2016-02-18
+
+* Fixed support in `GuzzleHttp\Psr7\CachingStream` for seeking forward on remote
+  streams, which can sometimes return fewer bytes than requested with `fread`.
+* Fixed handling of gzipped responses with FNAME headers.
+
+## 1.2.2 - 2016-01-22
+
+* Added support for URIs without any authority.
+* Added support for HTTP 451 'Unavailable For Legal Reasons.'
+* Added support for using '0' as a filename.
+* Added support for including non-standard ports in Host headers.
+
+## 1.2.1 - 2015-11-02
+
+* Now supporting negative offsets when seeking to SEEK_END.
+
+## 1.2.0 - 2015-08-15
+
+* Body as `"0"` is now properly added to a response.
+* Now allowing forward seeking in CachingStream.
+* Now properly parsing HTTP requests that contain proxy targets in
+  `parse_request`.
+* functions.php is now conditionally required.
+* user-info is no longer dropped when resolving URIs.
+
+## 1.1.0 - 2015-06-24
+
+* URIs can now be relative.
+* `multipart/form-data` headers are now overridden case-insensitively.
+* URI paths no longer encode the following characters because they are allowed
+  in URIs: "(", ")", "*", "!", "'"
+* A port is no longer added to a URI when the scheme is missing and no port is
+  present.
+
+## 1.0.0 - 2015-05-19
+
+Initial release.
+
+Currently unsupported:
+
+- `Psr\Http\Message\ServerRequestInterface`
+- `Psr\Http\Message\UploadedFileInterface`
diff --git a/Postman/Postman-Mail/mailgun/vendor/guzzlehttp/psr7/LICENSE b/Postman/Postman-Mail/mailgun/vendor/guzzlehttp/psr7/LICENSE
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+Copyright (c) 2015 Michael Dowling, https://github.com/mtdowling <mtdowling@gmail.com>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
diff --git a/Postman/Postman-Mail/mailgun/vendor/guzzlehttp/psr7/README.md b/Postman/Postman-Mail/mailgun/vendor/guzzlehttp/psr7/README.md
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+# PSR-7 Message Implementation
+
+This repository contains a full [PSR-7](http://www.php-fig.org/psr/psr-7/)
+message implementation, several stream decorators, and some helpful
+functionality like query string parsing.
+
+
+[![Build Status](https://travis-ci.org/guzzle/psr7.svg?branch=master)](https://travis-ci.org/guzzle/psr7)
+
+
+# Stream implementation
+
+This package comes with a number of stream implementations and stream
+decorators.
+
+
+## AppendStream
+
+`GuzzleHttp\Psr7\AppendStream`
+
+Reads from multiple streams, one after the other.
+
+```php
+use GuzzleHttp\Psr7;
+
+$a = Psr7\stream_for('abc, ');
+$b = Psr7\stream_for('123.');
+$composed = new Psr7\AppendStream([$a, $b]);
+
+$composed->addStream(Psr7\stream_for(' Above all listen to me'));
+
+echo $composed; // abc, 123. Above all listen to me.
+```
+
+
+## BufferStream
+
+`GuzzleHttp\Psr7\BufferStream`
+
+Provides a buffer stream that can be written to fill a buffer, and read
+from to remove bytes from the buffer.
+
+This stream returns a "hwm" metadata value that tells upstream consumers
+what the configured high water mark of the stream is, or the maximum
+preferred size of the buffer.
+
+```php
+use GuzzleHttp\Psr7;
+
+// When more than 1024 bytes are in the buffer, it will begin returning
+// false to writes. This is an indication that writers should slow down.
+$buffer = new Psr7\BufferStream(1024);
+```
+
+
+## CachingStream
+
+The CachingStream is used to allow seeking over previously read bytes on
+non-seekable streams. This can be useful when transferring a non-seekable
+entity body fails due to needing to rewind the stream (for example, resulting
+from a redirect). Data that is read from the remote stream will be buffered in
+a PHP temp stream so that previously read bytes are cached first in memory,
+then on disk.
+
+```php
+use GuzzleHttp\Psr7;
+
+$original = Psr7\stream_for(fopen('http://www.google.com', 'r'));
+$stream = new Psr7\CachingStream($original);
+
+$stream->read(1024);
+echo $stream->tell();
+// 1024
+
+$stream->seek(0);
+echo $stream->tell();
+// 0
+```
+
+
+## DroppingStream
+
+`GuzzleHttp\Psr7\DroppingStream`
+
+Stream decorator that begins dropping data once the size of the underlying
+stream becomes too full.
+
+```php
+use GuzzleHttp\Psr7;
+
+// Create an empty stream
+$stream = Psr7\stream_for();
+
+// Start dropping data when the stream has more than 10 bytes
+$dropping = new Psr7\DroppingStream($stream, 10);
+
+$dropping->write('01234567890123456789');
+echo $stream; // 0123456789
+```
+
+
+## FnStream
+
+`GuzzleHttp\Psr7\FnStream`
+
+Compose stream implementations based on a hash of functions.
+
+Allows for easy testing and extension of a provided stream without needing
+to create a concrete class for a simple extension point.
+
+```php
+
+use GuzzleHttp\Psr7;
+
+$stream = Psr7\stream_for('hi');
+$fnStream = Psr7\FnStream::decorate($stream, [
+    'rewind' => function () use ($stream) {
+        echo 'About to rewind - ';
+        $stream->rewind();
+        echo 'rewound!';
+    }
+]);
+
+$fnStream->rewind();
+// Outputs: About to rewind - rewound!
+```
+
+
+## InflateStream
+
+`GuzzleHttp\Psr7\InflateStream`
+
+Uses PHP's zlib.inflate filter to inflate deflate or gzipped content.
+
+This stream decorator skips the first 10 bytes of the given stream to remove
+the gzip header, converts the provided stream to a PHP stream resource,
+then appends the zlib.inflate filter. The stream is then converted back
+to a Guzzle stream resource to be used as a Guzzle stream.
+
+
+## LazyOpenStream
+
+`GuzzleHttp\Psr7\LazyOpenStream`
+
+Lazily reads or writes to a file that is opened only after an IO operation
+take place on the stream.
+
+```php
+use GuzzleHttp\Psr7;
+
+$stream = new Psr7\LazyOpenStream('/path/to/file', 'r');
+// The file has not yet been opened...
+
+echo $stream->read(10);
+// The file is opened and read from only when needed.
+```
+
+
+## LimitStream
+
+`GuzzleHttp\Psr7\LimitStream`
+
+LimitStream can be used to read a subset or slice of an existing stream object.
+This can be useful for breaking a large file into smaller pieces to be sent in
+chunks (e.g. Amazon S3's multipart upload API).
+
+```php
+use GuzzleHttp\Psr7;
+
+$original = Psr7\stream_for(fopen('/tmp/test.txt', 'r+'));
+echo $original->getSize();
+// >>> 1048576
+
+// Limit the size of the body to 1024 bytes and start reading from byte 2048
+$stream = new Psr7\LimitStream($original, 1024, 2048);
+echo $stream->getSize();
+// >>> 1024
+echo $stream->tell();
+// >>> 0
+```
+
+
+## MultipartStream
+
+`GuzzleHttp\Psr7\MultipartStream`
+
+Stream that when read returns bytes for a streaming multipart or
+multipart/form-data stream.
+
+
+## NoSeekStream
+
+`GuzzleHttp\Psr7\NoSeekStream`
+
+NoSeekStream wraps a stream and does not allow seeking.
+
+```php
+use GuzzleHttp\Psr7;
+
+$original = Psr7\stream_for('foo');
+$noSeek = new Psr7\NoSeekStream($original);
+
+echo $noSeek->read(3);
+// foo
+var_export($noSeek->isSeekable());
+// false
+$noSeek->seek(0);
+var_export($noSeek->read(3));
+// NULL
+```
+
+
+## PumpStream
+
+`GuzzleHttp\Psr7\PumpStream`
+
+Provides a read only stream that pumps data from a PHP callable.
+
+When invoking the provided callable, the PumpStream will pass the amount of
+data requested to read to the callable. The callable can choose to ignore
+this value and return fewer or more bytes than requested. Any extra data
+returned by the provided callable is buffered internally until drained using
+the read() function of the PumpStream. The provided callable MUST return
+false when there is no more data to read.
+
+
+## Implementing stream decorators
+
+Creating a stream decorator is very easy thanks to the
+`GuzzleHttp\Psr7\StreamDecoratorTrait`. This trait provides methods that
+implement `Psr\Http\Message\StreamInterface` by proxying to an underlying
+stream. Just `use` the `StreamDecoratorTrait` and implement your custom
+methods.
+
+For example, let's say we wanted to call a specific function each time the last
+byte is read from a stream. This could be implemented by overriding the
+`read()` method.
+
+```php
+use Psr\Http\Message\StreamInterface;
+use GuzzleHttp\Psr7\StreamDecoratorTrait;
+
+class EofCallbackStream implements StreamInterface
+{
+    use StreamDecoratorTrait;
+
+    private $callback;
+
+    public function __construct(StreamInterface $stream, callable $cb)
+    {
+        $this->stream = $stream;
+        $this->callback = $cb;
+    }
+
+    public function read($length)
+    {
+        $result = $this->stream->read($length);
+
+        // Invoke the callback when EOF is hit.
+        if ($this->eof()) {
+            call_user_func($this->callback);
+        }
+
+        return $result;
+    }
+}
+```
+
+This decorator could be added to any existing stream and used like so:
+
+```php
+use GuzzleHttp\Psr7;
+
+$original = Psr7\stream_for('foo');
+
+$eofStream = new EofCallbackStream($original, function () {
+    echo 'EOF!';
+});
+
+$eofStream->read(2);
+$eofStream->read(1);
+// echoes "EOF!"
+$eofStream->seek(0);
+$eofStream->read(3);
+// echoes "EOF!"
+```
+
+
+## PHP StreamWrapper
+
+You can use the `GuzzleHttp\Psr7\StreamWrapper` class if you need to use a
+PSR-7 stream as a PHP stream resource.
+
+Use the `GuzzleHttp\Psr7\StreamWrapper::getResource()` method to create a PHP
+stream from a PSR-7 stream.
+
+```php
+use GuzzleHttp\Psr7\StreamWrapper;
+
+$stream = GuzzleHttp\Psr7\stream_for('hello!');
+$resource = StreamWrapper::getResource($stream);
+echo fread($resource, 6); // outputs hello!
+```
+
+
+# Function API
+
+There are various functions available under the `GuzzleHttp\Psr7` namespace.
+
+
+## `function str`
+
+`function str(MessageInterface $message)`
+
+Returns the string representation of an HTTP message.
+
+```php
+$request = new GuzzleHttp\Psr7\Request('GET', 'http://example.com');
+echo GuzzleHttp\Psr7\str($request);
+```
+
+
+## `function uri_for`
+
+`function uri_for($uri)`
+
+This function accepts a string or `Psr\Http\Message\UriInterface` and returns a
+UriInterface for the given value. If the value is already a `UriInterface`, it
+is returned as-is.
+
+```php
+$uri = GuzzleHttp\Psr7\uri_for('http://example.com');
+assert($uri === GuzzleHttp\Psr7\uri_for($uri));
+```
+
+
+## `function stream_for`
+
+`function stream_for($resource = '', array $options = [])`
+
+Create a new stream based on the input type.
+
+Options is an associative array that can contain the following keys:
+
+* - metadata: Array of custom metadata.
+* - size: Size of the stream.
+
+This method accepts the following `$resource` types:
+
+- `Psr\Http\Message\StreamInterface`: Returns the value as-is.
+- `string`: Creates a stream object that uses the given string as the contents.
+- `resource`: Creates a stream object that wraps the given PHP stream resource.
+- `Iterator`: If the provided value implements `Iterator`, then a read-only
+  stream object will be created that wraps the given iterable. Each time the
+  stream is read from, data from the iterator will fill a buffer and will be
+  continuously called until the buffer is equal to the requested read size.
+  Subsequent read calls will first read from the buffer and then call `next`
+  on the underlying iterator until it is exhausted.
+- `object` with `__toString()`: If the object has the `__toString()` method,
+  the object will be cast to a string and then a stream will be returned that
+  uses the string value.
+- `NULL`: When `null` is passed, an empty stream object is returned.
+- `callable` When a callable is passed, a read-only stream object will be
+  created that invokes the given callable. The callable is invoked with the
+  number of suggested bytes to read. The callable can return any number of
+  bytes, but MUST return `false` when there is no more data to return. The
+  stream object that wraps the callable will invoke the callable until the
+  number of requested bytes are available. Any additional bytes will be
+  buffered and used in subsequent reads.
+
+```php
+$stream = GuzzleHttp\Psr7\stream_for('foo');
+$stream = GuzzleHttp\Psr7\stream_for(fopen('/path/to/file', 'r'));
+
+$generator function ($bytes) {
+    for ($i = 0; $i < $bytes; $i++) {
+        yield ' ';
+    }
+}
+
+$stream = GuzzleHttp\Psr7\stream_for($generator(100));
+```
+
+
+## `function parse_header`
+
+`function parse_header($header)`
+
+Parse an array of header values containing ";" separated data into an array of
+associative arrays representing the header key value pair data of the header.
+When a parameter does not contain a value, but just contains a key, this
+function will inject a key with a '' string value.
+
+
+## `function normalize_header`
+
+`function normalize_header($header)`
+
+Converts an array of header values that may contain comma separated headers
+into an array of headers with no comma separated values.
+
+
+## `function modify_request`
+
+`function modify_request(RequestInterface $request, array $changes)`
+
+Clone and modify a request with the given changes. This method is useful for
+reducing the number of clones needed to mutate a message.
+
+The changes can be one of:
+
+- method: (string) Changes the HTTP method.
+- set_headers: (array) Sets the given headers.
+- remove_headers: (array) Remove the given headers.
+- body: (mixed) Sets the given body.
+- uri: (UriInterface) Set the URI.
+- query: (string) Set the query string value of the URI.
+- version: (string) Set the protocol version.
+
+
+## `function rewind_body`
+
+`function rewind_body(MessageInterface $message)`
+
+Attempts to rewind a message body and throws an exception on failure. The body
+of the message will only be rewound if a call to `tell()` returns a value other
+than `0`.
+
+
+## `function try_fopen`
+
+`function try_fopen($filename, $mode)`
+
+Safely opens a PHP stream resource using a filename.
+
+When fopen fails, PHP normally raises a warning. This function adds an error
+handler that checks for errors and throws an exception instead.
+
+
+## `function copy_to_string`
+
+`function copy_to_string(StreamInterface $stream, $maxLen = -1)`
+
+Copy the contents of a stream into a string until the given number of bytes
+have been read.
+
+
+## `function copy_to_stream`
+
+`function copy_to_stream(StreamInterface $source, StreamInterface $dest, $maxLen = -1)`
+
+Copy the contents of a stream into another stream until the given number of
+bytes have been read.
+
+
+## `function hash`
+
+`function hash(StreamInterface $stream, $algo, $rawOutput = false)`
+
+Calculate a hash of a Stream. This method reads the entire stream to calculate
+a rolling hash (based on PHP's hash_init functions).
+
+
+## `function readline`
+
+`function readline(StreamInterface $stream, $maxLength = null)`
+
+Read a line from the stream up to the maximum allowed buffer length.
+
+
+## `function parse_request`
+
+`function parse_request($message)`
+
+Parses a request message string into a request object.
+
+
+## `function parse_response`
+
+`function parse_response($message)`
+
+Parses a response message string into a response object.
+
+
+## `function parse_query`
+
+`function parse_query($str, $urlEncoding = true)`
+
+Parse a query string into an associative array.
+
+If multiple values are found for the same key, the value of that key value pair
+will become an array. This function does not parse nested PHP style arrays into
+an associative array (e.g., `foo[a]=1&foo[b]=2` will be parsed into
+`['foo[a]' => '1', 'foo[b]' => '2']`).
+
+
+## `function build_query`
+
+`function build_query(array $params, $encoding = PHP_QUERY_RFC3986)`
+
+Build a query string from an array of key value pairs.
+
+This function can use the return value of parse_query() to build a query string.
+This function does not modify the provided keys when an array is encountered
+(like http_build_query would).
+
+
+## `function mimetype_from_filename`
+
+`function mimetype_from_filename($filename)`
+
+Determines the mimetype of a file by looking at its extension.
+
+
+## `function mimetype_from_extension`
+
+`function mimetype_from_extension($extension)`
+
+Maps a file extensions to a mimetype.
+
+
+# Additional URI Methods
+
+Aside from the standard `Psr\Http\Message\UriInterface` implementation in form of the `GuzzleHttp\Psr7\Uri` class,
+this library also provides additional functionality when working with URIs as static methods.
+
+## URI Types
+
+An instance of `Psr\Http\Message\UriInterface` can either be an absolute URI or a relative reference.
+An absolute URI has a scheme. A relative reference is used to express a URI relative to another URI,
+the base URI. Relative references can be divided into several forms according to
+[RFC 3986 Section 4.2](https://tools.ietf.org/html/rfc3986#section-4.2):
+
+- network-path references, e.g. `//example.com/path`
+- absolute-path references, e.g. `/path`
+- relative-path references, e.g. `subpath`
+
+The following methods can be used to identify the type of the URI.
+
+### `GuzzleHttp\Psr7\Uri::isAbsolute`
+
+`public static function isAbsolute(UriInterface $uri): bool`
+
+Whether the URI is absolute, i.e. it has a scheme.
+
+### `GuzzleHttp\Psr7\Uri::isNetworkPathReference`
+
+`public static function isNetworkPathReference(UriInterface $uri): bool`
+
+Whether the URI is a network-path reference. A relative reference that begins with two slash characters is
+termed an network-path reference.
+
+### `GuzzleHttp\Psr7\Uri::isAbsolutePathReference`
+
+`public static function isAbsolutePathReference(UriInterface $uri): bool`
+
+Whether the URI is a absolute-path reference. A relative reference that begins with a single slash character is
+termed an absolute-path reference.
+
+### `GuzzleHttp\Psr7\Uri::isRelativePathReference`
+
+`public static function isRelativePathReference(UriInterface $uri): bool`
+
+Whether the URI is a relative-path reference. A relative reference that does not begin with a slash character is
+termed a relative-path reference.
+
+### `GuzzleHttp\Psr7\Uri::isSameDocumentReference`
+
+`public static function isSameDocumentReference(UriInterface $uri, UriInterface $base = null): bool`
+
+Whether the URI is a same-document reference. A same-document reference refers to a URI that is, aside from its
+fragment component, identical to the base URI. When no base URI is given, only an empty URI reference
+(apart from its fragment) is considered a same-document reference.
+
+## URI Components
+
+Additional methods to work with URI components.
+
+### `GuzzleHttp\Psr7\Uri::isDefaultPort`
+
+`public static function isDefaultPort(UriInterface $uri): bool`
+
+Whether the URI has the default port of the current scheme. `Psr\Http\Message\UriInterface::getPort` may return null
+or the standard port. This method can be used independently of the implementation.
+
+### `GuzzleHttp\Psr7\Uri::composeComponents`
+
+`public static function composeComponents($scheme, $authority, $path, $query, $fragment): string`
+
+Composes a URI reference string from its various components according to
+[RFC 3986 Section 5.3](https://tools.ietf.org/html/rfc3986#section-5.3). Usually this method does not need to be called
+manually but instead is used indirectly via `Psr\Http\Message\UriInterface::__toString`.
+
+### `GuzzleHttp\Psr7\Uri::fromParts`
+
+`public static function fromParts(array $parts): UriInterface`
+
+Creates a URI from a hash of [`parse_url`](http://php.net/manual/en/function.parse-url.php) components.
+
+
+### `GuzzleHttp\Psr7\Uri::withQueryValue`
+
+`public static function withQueryValue(UriInterface $uri, $key, $value): UriInterface`
+
+Creates a new URI with a specific query string value. Any existing query string values that exactly match the
+provided key are removed and replaced with the given key value pair. A value of null will set the query string
+key without a value, e.g. "key" instead of "key=value".
+
+
+### `GuzzleHttp\Psr7\Uri::withoutQueryValue`
+
+`public static function withoutQueryValue(UriInterface $uri, $key): UriInterface`
+
+Creates a new URI with a specific query string value removed. Any existing query string values that exactly match the
+provided key are removed.
+
+## Reference Resolution
+
+`GuzzleHttp\Psr7\UriResolver` provides methods to resolve a URI reference in the context of a base URI according
+to [RFC 3986 Section 5](https://tools.ietf.org/html/rfc3986#section-5). This is for example also what web browsers
+do when resolving a link in a website based on the current request URI.
+
+### `GuzzleHttp\Psr7\UriResolver::resolve`
+
+`public static function resolve(UriInterface $base, UriInterface $rel): UriInterface`
+
+Converts the relative URI into a new URI that is resolved against the base URI.
+
+### `GuzzleHttp\Psr7\UriResolver::removeDotSegments`
+
+`public static function removeDotSegments(string $path): string`
+
+Removes dot segments from a path and returns the new path according to
+[RFC 3986 Section 5.2.4](https://tools.ietf.org/html/rfc3986#section-5.2.4).
+
+### `GuzzleHttp\Psr7\UriResolver::relativize`
+
+`public static function relativize(UriInterface $base, UriInterface $target): UriInterface`
+
+Returns the target URI as a relative reference from the base URI. This method is the counterpart to resolve():
+
+```php
+(string) $target === (string) UriResolver::resolve($base, UriResolver::relativize($base, $target))
+```
+
+One use-case is to use the current request URI as base URI and then generate relative links in your documents
+to reduce the document size or offer self-contained downloadable document archives.
+
+```php
+$base = new Uri('http://example.com/a/b/');
+echo UriResolver::relativize($base, new Uri('http://example.com/a/b/c'));  // prints 'c'.
+echo UriResolver::relativize($base, new Uri('http://example.com/a/x/y'));  // prints '../x/y'.
+echo UriResolver::relativize($base, new Uri('http://example.com/a/b/?q')); // prints '?q'.
+echo UriResolver::relativize($base, new Uri('http://example.org/a/b/'));   // prints '//example.org/a/b/'.
+```
+
+## Normalization and Comparison
+
+`GuzzleHttp\Psr7\UriNormalizer` provides methods to normalize and compare URIs according to
+[RFC 3986 Section 6](https://tools.ietf.org/html/rfc3986#section-6).
+
+### `GuzzleHttp\Psr7\UriNormalizer::normalize`
+
+`public static function normalize(UriInterface $uri, $flags = self::PRESERVING_NORMALIZATIONS): UriInterface`
+
+Returns a normalized URI. The scheme and host component are already normalized to lowercase per PSR-7 UriInterface.
+This methods adds additional normalizations that can be configured with the `$flags` parameter which is a bitmask
+of normalizations to apply. The following normalizations are available:
+
+- `UriNormalizer::PRESERVING_NORMALIZATIONS`
+
+    Default normalizations which only include the ones that preserve semantics.
+
+- `UriNormalizer::CAPITALIZE_PERCENT_ENCODING`
+
+    All letters within a percent-encoding triplet (e.g., "%3A") are case-insensitive, and should be capitalized.
+
+    Example: `http://example.org/a%c2%b1b` → `http://example.org/a%C2%B1b`
+
+- `UriNormalizer::DECODE_UNRESERVED_CHARACTERS`
+
+    Decodes percent-encoded octets of unreserved characters. For consistency, percent-encoded octets in the ranges of
+    ALPHA (%41–%5A and %61–%7A), DIGIT (%30–%39), hyphen (%2D), period (%2E), underscore (%5F), or tilde (%7E) should
+    not be created by URI producers and, when found in a URI, should be decoded to their corresponding unreserved
+    characters by URI normalizers.
+
+    Example: `http://example.org/%7Eusern%61me/` → `http://example.org/~username/`
+
+- `UriNormalizer::CONVERT_EMPTY_PATH`
+
+    Converts the empty path to "/" for http and https URIs.
+
+    Example: `http://example.org` → `http://example.org/`
+
+- `UriNormalizer::REMOVE_DEFAULT_HOST`
+
+    Removes the default host of the given URI scheme from the URI. Only the "file" scheme defines the default host
+    "localhost". All of `file:/myfile`, `file:///myfile`, and `file://localhost/myfile` are equivalent according to
+    RFC 3986.
+
+    Example: `file://localhost/myfile` → `file:///myfile`
+
+- `UriNormalizer::REMOVE_DEFAULT_PORT`
+
+    Removes the default port of the given URI scheme from the URI.
+
+    Example: `http://example.org:80/` → `http://example.org/`
+
+- `UriNormalizer::REMOVE_DOT_SEGMENTS`
+
+    Removes unnecessary dot-segments. Dot-segments in relative-path references are not removed as it would
+    change the semantics of the URI reference.
+
+    Example: `http://example.org/../a/b/../c/./d.html` → `http://example.org/a/c/d.html`
+
+- `UriNormalizer::REMOVE_DUPLICATE_SLASHES`
+
+    Paths which include two or more adjacent slashes are converted to one. Webservers usually ignore duplicate slashes
+    and treat those URIs equivalent. But in theory those URIs do not need to be equivalent. So this normalization
+    may change the semantics. Encoded slashes (%2F) are not removed.
+
+    Example: `http://example.org//foo///bar.html` → `http://example.org/foo/bar.html`
+
+- `UriNormalizer::SORT_QUERY_PARAMETERS`
+
+    Sort query parameters with their values in alphabetical order. However, the order of parameters in a URI may be
+    significant (this is not defined by the standard). So this normalization is not safe and may change the semantics
+    of the URI.
+
+    Example: `?lang=en&article=fred` → `?article=fred&lang=en`
+
+### `GuzzleHttp\Psr7\UriNormalizer::isEquivalent`
+
+`public static function isEquivalent(UriInterface $uri1, UriInterface $uri2, $normalizations = self::PRESERVING_NORMALIZATIONS): bool`
+
+Whether two URIs can be considered equivalent. Both URIs are normalized automatically before comparison with the given
+`$normalizations` bitmask. The method also accepts relative URI references and returns true when they are equivalent.
+This of course assumes they will be resolved against the same base URI. If this is not the case, determination of
+equivalence or difference of relative references does not mean anything.
diff --git a/Postman/Postman-Mail/mailgun/vendor/guzzlehttp/psr7/composer.json b/Postman/Postman-Mail/mailgun/vendor/guzzlehttp/psr7/composer.json
new file mode 100644
index 0000000..b1c5a90
--- /dev/null
+++ b/Postman/Postman-Mail/mailgun/vendor/guzzlehttp/psr7/composer.json
@@ -0,0 +1,39 @@
+{
+    "name": "guzzlehttp/psr7",
+    "type": "library",
+    "description": "PSR-7 message implementation that also provides common utility methods",
+    "keywords": ["request", "response", "message", "stream", "http", "uri", "url"],
+    "license": "MIT",
+    "authors": [
+        {
+            "name": "Michael Dowling",
+            "email": "mtdowling@gmail.com",
+            "homepage": "https://github.com/mtdowling"
+        },
+        {
+            "name": "Tobias Schultze",
+            "homepage": "https://github.com/Tobion"
+        }
+    ],
+    "require": {
+        "php": ">=5.4.0",
+        "psr/http-message": "~1.0"
+    },
+    "require-dev": {
+        "phpunit/phpunit": "~4.0"
+    },
+    "provide": {
+        "psr/http-message-implementation": "1.0"
+    },
+    "autoload": {
+        "psr-4": {
+            "GuzzleHttp\\Psr7\\": "src/"
+        },
+        "files": ["src/functions_include.php"]
+    },
+    "extra": {
+        "branch-alias": {
+            "dev-master": "1.4-dev"
+        }
+    }
+}
diff --git a/Postman/Postman-Mail/mailgun/vendor/guzzlehttp/psr7/src/AppendStream.php b/Postman/Postman-Mail/mailgun/vendor/guzzlehttp/psr7/src/AppendStream.php
new file mode 100644
index 0000000..23039fd
--- /dev/null
+++ b/Postman/Postman-Mail/mailgun/vendor/guzzlehttp/psr7/src/AppendStream.php
@@ -0,0 +1,233 @@
+<?php
+namespace GuzzleHttp\Psr7;
+
+use Psr\Http\Message\StreamInterface;
+
+/**
+ * Reads from multiple streams, one after the other.
+ *
+ * This is a read-only stream decorator.
+ */
+class AppendStream implements StreamInterface
+{
+    /** @var StreamInterface[] Streams being decorated */
+    private $streams = [];
+
+    private $seekable = true;
+    private $current = 0;
+    private $pos = 0;
+    private $detached = false;
+
+    /**
+     * @param StreamInterface[] $streams Streams to decorate. Each stream must
+     *                                   be readable.
+     */
+    public function __construct(array $streams = [])
+    {
+        foreach ($streams as $stream) {
+            $this->addStream($stream);
+        }
+    }
+
+    public function __toString()
+    {
+        try {
+            $this->rewind();
+            return $this->getContents();
+        } catch (\Exception $e) {
+            return '';
+        }
+    }
+
+    /**
+     * Add a stream to the AppendStream
+     *
+     * @param StreamInterface $stream Stream to append. Must be readable.
+     *
+     * @throws \InvalidArgumentException if the stream is not readable
+     */
+    public function addStream(StreamInterface $stream)
+    {
+        if (!$stream->isReadable()) {
+            throw new \InvalidArgumentException('Each stream must be readable');
+        }
+
+        // The stream is only seekable if all streams are seekable
+        if (!$stream->isSeekable()) {
+            $this->seekable = false;
+        }
+
+        $this->streams[] = $stream;
+    }
+
+    public function getContents()
+    {
+        return copy_to_string($this);
+    }
+
+    /**
+     * Closes each attached stream.
+     *
+     * {@inheritdoc}
+     */
+    public function close()
+    {
+        $this->pos = $this->current = 0;
+
+        foreach ($this->streams as $stream) {
+            $stream->close();
+        }
+
+        $this->streams = [];
+    }
+
+    /**
+     * Detaches each attached stream
+     *
+     * {@inheritdoc}
+     */
+    public function detach()
+    {
+        $this->close();
+        $this->detached = true;
+    }
+
+    public function tell()
+    {
+        return $this->pos;
+    }
+
+    /**
+     * Tries to calculate the size by adding the size of each stream.
+     *
+     * If any of the streams do not return a valid number, then the size of the
+     * append stream cannot be determined and null is returned.
+     *
+     * {@inheritdoc}
+     */
+    public function getSize()
+    {
+        $size = 0;
+
+        foreach ($this->streams as $stream) {
+            $s = $stream->getSize();
+            if ($s === null) {
+                return null;
+            }
+            $size += $s;
+        }
+
+        return $size;
+    }
+
+    public function eof()
+    {
+        return !$this->streams ||
+            ($this->current >= count($this->streams) - 1 &&
+             $this->streams[$this->current]->eof());
+    }
+
+    public function rewind()
+    {
+        $this->seek(0);
+    }
+
+    /**
+     * Attempts to seek to the given position. Only supports SEEK_SET.
+     *
+     * {@inheritdoc}
+     */
+    public function seek($offset, $whence = SEEK_SET)
+    {
+        if (!$this->seekable) {
+            throw new \RuntimeException('This AppendStream is not seekable');
+        } elseif ($whence !== SEEK_SET) {
+            throw new \RuntimeException('The AppendStream can only seek with SEEK_SET');
+        }
+
+        $this->pos = $this->current = 0;
+
+        // Rewind each stream
+        foreach ($this->streams as $i => $stream) {
+            try {
+                $stream->rewind();
+            } catch (\Exception $e) {
+                throw new \RuntimeException('Unable to seek stream '
+                    . $i . ' of the AppendStream', 0, $e);
+            }
+        }
+
+        // Seek to the actual position by reading from each stream
+        while ($this->pos < $offset && !$this->eof()) {
+            $result = $this->read(min(8096, $offset - $this->pos));
+            if ($result === '') {
+                break;
+            }
+        }
+    }
+
+    /**
+     * Reads from all of the appended streams until the length is met or EOF.
+     *
+     * {@inheritdoc}
+     */
+    public function read($length)
+    {
+        $buffer = '';
+        $total = count($this->streams) - 1;
+        $remaining = $length;
+        $progressToNext = false;
+
+        while ($remaining > 0) {
+
+            // Progress to the next stream if needed.
+            if ($progressToNext || $this->streams[$this->current]->eof()) {
+                $progressToNext = false;
+                if ($this->current === $total) {
+                    break;
+                }
+                $this->current++;
+            }
+
+            $result = $this->streams[$this->current]->read($remaining);
+
+            // Using a loose comparison here to match on '', false, and null
+            if ($result == null) {
+                $progressToNext = true;
+                continue;
+            }
+
+            $buffer .= $result;
+            $remaining = $length - strlen($buffer);
+        }
+
+        $this->pos += strlen($buffer);
+
+        return $buffer;
+    }
+
+    public function isReadable()
+    {
+        return true;
+    }
+
+    public function isWritable()
+    {
+        return false;
+    }
+
+    public function isSeekable()
+    {
+        return $this->seekable;
+    }
+
+    public function write($string)
+    {
+        throw new \RuntimeException('Cannot write to an AppendStream');
+    }
+
+    public function getMetadata($key = null)
+    {
+        return $key ? null : [];
+    }
+}
diff --git a/Postman/Postman-Mail/mailgun/vendor/guzzlehttp/psr7/src/BufferStream.php b/Postman/Postman-Mail/mailgun/vendor/guzzlehttp/psr7/src/BufferStream.php
new file mode 100644
index 0000000..af4d4c2
--- /dev/null
+++ b/Postman/Postman-Mail/mailgun/vendor/guzzlehttp/psr7/src/BufferStream.php
@@ -0,0 +1,137 @@
+<?php
+namespace GuzzleHttp\Psr7;
+
+use Psr\Http\Message\StreamInterface;
+
+/**
+ * Provides a buffer stream that can be written to to fill a buffer, and read
+ * from to remove bytes from the buffer.
+ *
+ * This stream returns a "hwm" metadata value that tells upstream consumers
+ * what the configured high water mark of the stream is, or the maximum
+ * preferred size of the buffer.
+ */
+class BufferStream implements StreamInterface
+{
+    private $hwm;
+    private $buffer = '';
+
+    /**
+     * @param int $hwm High water mark, representing the preferred maximum
+     *                 buffer size. If the size of the buffer exceeds the high
+     *                 water mark, then calls to write will continue to succeed
+     *                 but will return false to inform writers to slow down
+     *                 until the buffer has been drained by reading from it.
+     */
+    public function __construct($hwm = 16384)
+    {
+        $this->hwm = $hwm;
+    }
+
+    public function __toString()
+    {
+        return $this->getContents();
+    }
+
+    public function getContents()
+    {
+        $buffer = $this->buffer;
+        $this->buffer = '';
+
+        return $buffer;
+    }
+
+    public function close()
+    {
+        $this->buffer = '';
+    }
+
+    public function detach()
+    {
+        $this->close();
+    }
+
+    public function getSize()
+    {
+        return strlen($this->buffer);
+    }
+
+    public function isReadable()
+    {
+        return true;
+    }
+
+    public function isWritable()
+    {
+        return true;
+    }
+
+    public function isSeekable()
+    {
+        return false;
+    }
+
+    public function rewind()
+    {
+        $this->seek(0);
+    }
+
+    public function seek($offset, $whence = SEEK_SET)
+    {
+        throw new \RuntimeException('Cannot seek a BufferStream');
+    }
+
+    public function eof()
+    {
+        return strlen($this->buffer) === 0;
+    }
+
+    public function tell()
+    {
+        throw new \RuntimeException('Cannot determine the position of a BufferStream');
+    }
+
+    /**
+     * Reads data from the buffer.
+     */
+    public function read($length)
+    {
+        $currentLength = strlen($this->buffer);
+
+        if ($length >= $currentLength) {
+            // No need to slice the buffer because we don't have enough data.
+            $result = $this->buffer;
+            $this->buffer = '';
+        } else {
+            // Slice up the result to provide a subset of the buffer.
+            $result = substr($this->buffer, 0, $length);
+            $this->buffer = substr($this->buffer, $length);
+        }
+
+        return $result;
+    }
+
+    /**
+     * Writes data to the buffer.
+     */
+    public function write($string)
+    {
+        $this->buffer .= $string;
+
+        // TODO: What should happen here?
+        if (strlen($this->buffer) >= $this->hwm) {
+            return false;
+        }
+
+        return strlen($string);
+    }
+
+    public function getMetadata($key = null)
+    {
+        if ($key == 'hwm') {
+            return $this->hwm;
+        }
+
+        return $key ? null : [];
+    }
+}
diff --git a/Postman/Postman-Mail/mailgun/vendor/guzzlehttp/psr7/src/CachingStream.php b/Postman/Postman-Mail/mailgun/vendor/guzzlehttp/psr7/src/CachingStream.php
new file mode 100644
index 0000000..ed68f08
--- /dev/null
+++ b/Postman/Postman-Mail/mailgun/vendor/guzzlehttp/psr7/src/CachingStream.php
@@ -0,0 +1,138 @@
+<?php
+namespace GuzzleHttp\Psr7;
+
+use Psr\Http\Message\StreamInterface;
+
+/**
+ * Stream decorator that can cache previously read bytes from a sequentially
+ * read stream.
+ */
+class CachingStream implements StreamInterface
+{
+    use StreamDecoratorTrait;
+
+    /** @var StreamInterface Stream being wrapped */
+    private $remoteStream;
+
+    /** @var int Number of bytes to skip reading due to a write on the buffer */
+    private $skipReadBytes = 0;
+
+    /**
+     * We will treat the buffer object as the body of the stream
+     *
+     * @param StreamInterface $stream Stream to cache
+     * @param StreamInterface $target Optionally specify where data is cached
+     */
+    public function __construct(
+        StreamInterface $stream,
+        StreamInterface $target = null
+    ) {
+        $this->remoteStream = $stream;
+        $this->stream = $target ?: new Stream(fopen('php://temp', 'r+'));
+    }
+
+    public function getSize()
+    {
+        return max($this->stream->getSize(), $this->remoteStream->getSize());
+    }
+
+    public function rewind()
+    {
+        $this->seek(0);
+    }
+
+    public function seek($offset, $whence = SEEK_SET)
+    {
+        if ($whence == SEEK_SET) {
+            $byte = $offset;
+        } elseif ($whence == SEEK_CUR) {
+            $byte = $offset + $this->tell();
+        } elseif ($whence == SEEK_END) {
+            $size = $this->remoteStream->getSize();
+            if ($size === null) {
+                $size = $this->cacheEntireStream();
+            }
+            $byte = $size + $offset;
+        } else {
+            throw new \InvalidArgumentException('Invalid whence');
+        }
+
+        $diff = $byte - $this->stream->getSize();
+
+        if ($diff > 0) {
+            // Read the remoteStream until we have read in at least the amount
+            // of bytes requested, or we reach the end of the file.
+            while ($diff > 0 && !$this->remoteStream->eof()) {
+                $this->read($diff);
+                $diff = $byte - $this->stream->getSize();
+            }
+        } else {
+            // We can just do a normal seek since we've already seen this byte.
+            $this->stream->seek($byte);
+        }
+    }
+
+    public function read($length)
+    {
+        // Perform a regular read on any previously read data from the buffer
+        $data = $this->stream->read($length);
+        $remaining = $length - strlen($data);
+
+        // More data was requested so read from the remote stream
+        if ($remaining) {
+            // If data was written to the buffer in a position that would have
+            // been filled from the remote stream, then we must skip bytes on
+            // the remote stream to emulate overwriting bytes from that
+            // position. This mimics the behavior of other PHP stream wrappers.
+            $remoteData = $this->remoteStream->read(
+                $remaining + $this->skipReadBytes
+            );
+
+            if ($this->skipReadBytes) {
+                $len = strlen($remoteData);
+                $remoteData = substr($remoteData, $this->skipReadBytes);
+                $this->skipReadBytes = max(0, $this->skipReadBytes - $len);
+            }
+
+            $data .= $remoteData;
+            $this->stream->write($remoteData);
+        }
+
+        return $data;
+    }
+
+    public function write($string)
+    {
+        // When appending to the end of the currently read stream, you'll want
+        // to skip bytes from being read from the remote stream to emulate
+        // other stream wrappers. Basically replacing bytes of data of a fixed
+        // length.
+        $overflow = (strlen($string) + $this->tell()) - $this->remoteStream->tell();
+        if ($overflow > 0) {
+            $this->skipReadBytes += $overflow;
+        }
+
+        return $this->stream->write($string);
+    }
+
+    public function eof()
+    {
+        return $this->stream->eof() && $this->remoteStream->eof();
+    }
+
+    /**
+     * Close both the remote stream and buffer stream
+     */
+    public function close()
+    {
+        $this->remoteStream->close() && $this->stream->close();
+    }
+
+    private function cacheEntireStream()
+    {
+        $target = new FnStream(['write' => 'strlen']);
+        copy_to_stream($this, $target);
+
+        return $this->tell();
+    }
+}
diff --git a/Postman/Postman-Mail/mailgun/vendor/guzzlehttp/psr7/src/DroppingStream.php b/Postman/Postman-Mail/mailgun/vendor/guzzlehttp/psr7/src/DroppingStream.php
new file mode 100644
index 0000000..8935c80
--- /dev/null
+++ b/Postman/Postman-Mail/mailgun/vendor/guzzlehttp/psr7/src/DroppingStream.php
@@ -0,0 +1,42 @@
+<?php
+namespace GuzzleHttp\Psr7;
+
+use Psr\Http\Message\StreamInterface;
+
+/**
+ * Stream decorator that begins dropping data once the size of the underlying
+ * stream becomes too full.
+ */
+class DroppingStream implements StreamInterface
+{
+    use StreamDecoratorTrait;
+
+    private $maxLength;
+
+    /**
+     * @param StreamInterface $stream    Underlying stream to decorate.
+     * @param int             $maxLength Maximum size before dropping data.
+     */
+    public function __construct(StreamInterface $stream, $maxLength)
+    {
+        $this->stream = $stream;
+        $this->maxLength = $maxLength;
+    }
+
+    public function write($string)
+    {
+        $diff = $this->maxLength - $this->stream->getSize();
+
+        // Begin returning 0 when the underlying stream is too large.
+        if ($diff <= 0) {
+            return 0;
+        }
+
+        // Write the stream or a subset of the stream if needed.
+        if (strlen($string) < $diff) {
+            return $this->stream->write($string);
+        }
+
+        return $this->stream->write(substr($string, 0, $diff));
+    }
+}
diff --git a/Postman/Postman-Mail/mailgun/vendor/guzzlehttp/psr7/src/FnStream.php b/Postman/Postman-Mail/mailgun/vendor/guzzlehttp/psr7/src/FnStream.php
new file mode 100644
index 0000000..cc9b445
--- /dev/null
+++ b/Postman/Postman-Mail/mailgun/vendor/guzzlehttp/psr7/src/FnStream.php
@@ -0,0 +1,149 @@
+<?php
+namespace GuzzleHttp\Psr7;
+
+use Psr\Http\Message\StreamInterface;
+
+/**
+ * Compose stream implementations based on a hash of functions.
+ *
+ * Allows for easy testing and extension of a provided stream without needing
+ * to create a concrete class for a simple extension point.
+ */
+class FnStream implements StreamInterface
+{
+    /** @var array */
+    private $methods;
+
+    /** @var array Methods that must be implemented in the given array */
+    private static $slots = ['__toString', 'close', 'detach', 'rewind',
+        'getSize', 'tell', 'eof', 'isSeekable', 'seek', 'isWritable', 'write',
+        'isReadable', 'read', 'getContents', 'getMetadata'];
+
+    /**
+     * @param array $methods Hash of method name to a callable.
+     */
+    public function __construct(array $methods)
+    {
+        $this->methods = $methods;
+
+        // Create the functions on the class
+        foreach ($methods as $name => $fn) {
+            $this->{'_fn_' . $name} = $fn;
+        }
+    }
+
+    /**
+     * Lazily determine which methods are not implemented.
+     * @throws \BadMethodCallException
+     */
+    public function __get($name)
+    {
+        throw new \BadMethodCallException(str_replace('_fn_', '', $name)
+            . '() is not implemented in the FnStream');
+    }
+
+    /**
+     * The close method is called on the underlying stream only if possible.
+     */
+    public function __destruct()
+    {
+        if (isset($this->_fn_close)) {
+            call_user_func($this->_fn_close);
+        }
+    }
+
+    /**
+     * Adds custom functionality to an underlying stream by intercepting
+     * specific method calls.
+     *
+     * @param StreamInterface $stream  Stream to decorate
+     * @param array           $methods Hash of method name to a closure
+     *
+     * @return FnStream
+     */
+    public static function decorate(StreamInterface $stream, array $methods)
+    {
+        // If any of the required methods were not provided, then simply
+        // proxy to the decorated stream.
+        foreach (array_diff(self::$slots, array_keys($methods)) as $diff) {
+            $methods[$diff] = [$stream, $diff];
+        }
+
+        return new self($methods);
+    }
+
+    public function __toString()
+    {
+        return call_user_func($this->_fn___toString);
+    }
+
+    public function close()
+    {
+        return call_user_func($this->_fn_close);
+    }
+
+    public function detach()
+    {
+        return call_user_func($this->_fn_detach);
+    }
+
+    public function getSize()
+    {
+        return call_user_func($this->_fn_getSize);
+    }
+
+    public function tell()
+    {
+        return call_user_func($this->_fn_tell);
+    }
+
+    public function eof()
+    {
+        return call_user_func($this->_fn_eof);
+    }
+
+    public function isSeekable()
+    {
+        return call_user_func($this->_fn_isSeekable);
+    }
+
+    public function rewind()
+    {
+        call_user_func($this->_fn_rewind);
+    }
+
+    public function seek($offset, $whence = SEEK_SET)
+    {
+        call_user_func($this->_fn_seek, $offset, $whence);
+    }
+
+    public function isWritable()
+    {
+        return call_user_func($this->_fn_isWritable);
+    }
+
+    public function write($string)
+    {
+        return call_user_func($this->_fn_write, $string);
+    }
+
+    public function isReadable()
+    {
+        return call_user_func($this->_fn_isReadable);
+    }
+
+    public function read($length)
+    {
+        return call_user_func($this->_fn_read, $length);
+    }
+
+    public function getContents()
+    {
+        return call_user_func($this->_fn_getContents);
+    }
+
+    public function getMetadata($key = null)
+    {
+        return call_user_func($this->_fn_getMetadata, $key);
+    }
+}
diff --git a/Postman/Postman-Mail/mailgun/vendor/guzzlehttp/psr7/src/InflateStream.php b/Postman/Postman-Mail/mailgun/vendor/guzzlehttp/psr7/src/InflateStream.php
new file mode 100644
index 0000000..0051d3f
--- /dev/null
+++ b/Postman/Postman-Mail/mailgun/vendor/guzzlehttp/psr7/src/InflateStream.php
@@ -0,0 +1,52 @@
+<?php
+namespace GuzzleHttp\Psr7;
+
+use Psr\Http\Message\StreamInterface;
+
+/**
+ * Uses PHP's zlib.inflate filter to inflate deflate or gzipped content.
+ *
+ * This stream decorator skips the first 10 bytes of the given stream to remove
+ * the gzip header, converts the provided stream to a PHP stream resource,
+ * then appends the zlib.inflate filter. The stream is then converted back
+ * to a Guzzle stream resource to be used as a Guzzle stream.
+ *
+ * @link http://tools.ietf.org/html/rfc1952
+ * @link http://php.net/manual/en/filters.compression.php
+ */
+class InflateStream implements StreamInterface
+{
+    use StreamDecoratorTrait;
+
+    public function __construct(StreamInterface $stream)
+    {
+        // read the first 10 bytes, ie. gzip header
+        $header = $stream->read(10);
+        $filenameHeaderLength = $this->getLengthOfPossibleFilenameHeader($stream, $header);
+        // Skip the header, that is 10 + length of filename + 1 (nil) bytes
+        $stream = new LimitStream($stream, -1, 10 + $filenameHeaderLength);
+        $resource = StreamWrapper::getResource($stream);
+        stream_filter_append($resource, 'zlib.inflate', STREAM_FILTER_READ);
+        $this->stream = new Stream($resource);
+    }
+
+    /**
+     * @param StreamInterface $stream
+     * @param $header
+     * @return int
+     */
+    private function getLengthOfPossibleFilenameHeader(StreamInterface $stream, $header)
+    {
+        $filename_header_length = 0;
+
+        if (substr(bin2hex($header), 6, 2) === '08') {
+            // we have a filename, read until nil
+            $filename_header_length = 1;
+            while ($stream->read(1) !== chr(0)) {
+                $filename_header_length++;
+            }
+        }
+
+        return $filename_header_length;
+    }
+}
diff --git a/Postman/Postman-Mail/mailgun/vendor/guzzlehttp/psr7/src/LazyOpenStream.php b/Postman/Postman-Mail/mailgun/vendor/guzzlehttp/psr7/src/LazyOpenStream.php
new file mode 100644
index 0000000..02cec3a
--- /dev/null
+++ b/Postman/Postman-Mail/mailgun/vendor/guzzlehttp/psr7/src/LazyOpenStream.php
@@ -0,0 +1,39 @@
+<?php
+namespace GuzzleHttp\Psr7;
+
+use Psr\Http\Message\StreamInterface;
+
+/**
+ * Lazily reads or writes to a file that is opened only after an IO operation
+ * take place on the stream.
+ */
+class LazyOpenStream implements StreamInterface
+{
+    use StreamDecoratorTrait;
+
+    /** @var string File to open */
+    private $filename;
+
+    /** @var string $mode */
+    private $mode;
+
+    /**
+     * @param string $filename File to lazily open
+     * @param string $mode     fopen mode to use when opening the stream
+     */
+    public function __construct($filename, $mode)
+    {
+        $this->filename = $filename;
+        $this->mode = $mode;
+    }
+
+    /**
+     * Creates the underlying stream lazily when required.
+     *
+     * @return StreamInterface
+     */
+    protected function createStream()
+    {
+        return stream_for(try_fopen($this->filename, $this->mode));
+    }
+}
diff --git a/Postman/Postman-Mail/mailgun/vendor/guzzlehttp/psr7/src/LimitStream.php b/Postman/Postman-Mail/mailgun/vendor/guzzlehttp/psr7/src/LimitStream.php
new file mode 100644
index 0000000..3c13d4f
--- /dev/null
+++ b/Postman/Postman-Mail/mailgun/vendor/guzzlehttp/psr7/src/LimitStream.php
@@ -0,0 +1,155 @@
+<?php
+namespace GuzzleHttp\Psr7;
+
+use Psr\Http\Message\StreamInterface;
+
+
+/**
+ * Decorator used to return only a subset of a stream
+ */
+class LimitStream implements StreamInterface
+{
+    use StreamDecoratorTrait;
+
+    /** @var int Offset to start reading from */
+    private $offset;
+
+    /** @var int Limit the number of bytes that can be read */
+    private $limit;
+
+    /**
+     * @param StreamInterface $stream Stream to wrap
+     * @param int             $limit  Total number of bytes to allow to be read
+     *                                from the stream. Pass -1 for no limit.
+     * @param int             $offset Position to seek to before reading (only
+     *                                works on seekable streams).
+     */
+    public function __construct(
+        StreamInterface $stream,
+        $limit = -1,
+        $offset = 0
+    ) {
+        $this->stream = $stream;
+        $this->setLimit($limit);
+        $this->setOffset($offset);
+    }
+
+    public function eof()
+    {
+        // Always return true if the underlying stream is EOF
+        if ($this->stream->eof()) {
+            return true;
+        }
+
+        // No limit and the underlying stream is not at EOF
+        if ($this->limit == -1) {
+            return false;
+        }
+
+        return $this->stream->tell() >= $this->offset + $this->limit;
+    }
+
+    /**
+     * Returns the size of the limited subset of data
+     * {@inheritdoc}
+     */
+    public function getSize()
+    {
+        if (null === ($length = $this->stream->getSize())) {
+            return null;
+        } elseif ($this->limit == -1) {
+            return $length - $this->offset;
+        } else {
+            return min($this->limit, $length - $this->offset);
+        }
+    }
+
+    /**
+     * Allow for a bounded seek on the read limited stream
+     * {@inheritdoc}
+     */
+    public function seek($offset, $whence = SEEK_SET)
+    {
+        if ($whence !== SEEK_SET || $offset < 0) {
+            throw new \RuntimeException(sprintf(
+                'Cannot seek to offset % with whence %s',
+                $offset,
+                $whence
+            ));
+        }
+
+        $offset += $this->offset;
+
+        if ($this->limit !== -1) {
+            if ($offset > $this->offset + $this->limit) {
+                $offset = $this->offset + $this->limit;
+            }
+        }
+
+        $this->stream->seek($offset);
+    }
+
+    /**
+     * Give a relative tell()
+     * {@inheritdoc}
+     */
+    public function tell()
+    {
+        return $this->stream->tell() - $this->offset;
+    }
+
+    /**
+     * Set the offset to start limiting from
+     *
+     * @param int $offset Offset to seek to and begin byte limiting from
+     *
+     * @throws \RuntimeException if the stream cannot be seeked.
+     */
+    public function setOffset($offset)
+    {
+        $current = $this->stream->tell();
+
+        if ($current !== $offset) {
+            // If the stream cannot seek to the offset position, then read to it
+            if ($this->stream->isSeekable()) {
+                $this->stream->seek($offset);
+            } elseif ($current > $offset) {
+                throw new \RuntimeException("Could not seek to stream offset $offset");
+            } else {
+                $this->stream->read($offset - $current);
+            }
+        }
+
+        $this->offset = $offset;
+    }
+
+    /**
+     * Set the limit of bytes that the decorator allows to be read from the
+     * stream.
+     *
+     * @param int $limit Number of bytes to allow to be read from the stream.
+     *                   Use -1 for no limit.
+     */
+    public function setLimit($limit)
+    {
+        $this->limit = $limit;
+    }
+
+    public function read($length)
+    {
+        if ($this->limit == -1) {
+            return $this->stream->read($length);
+        }
+
+        // Check if the current position is less than the total allowed
+        // bytes + original offset
+        $remaining = ($this->offset + $this->limit) - $this->stream->tell();
+        if ($remaining > 0) {
+            // Only return the amount of requested data, ensuring that the byte
+            // limit is not exceeded
+            return $this->stream->read(min($remaining, $length));
+        }
+
+        return '';
+    }
+}
diff --git a/Postman/Postman-Mail/mailgun/vendor/guzzlehttp/psr7/src/MessageTrait.php b/Postman/Postman-Mail/mailgun/vendor/guzzlehttp/psr7/src/MessageTrait.php
new file mode 100644
index 0000000..1e4da64
--- /dev/null
+++ b/Postman/Postman-Mail/mailgun/vendor/guzzlehttp/psr7/src/MessageTrait.php
@@ -0,0 +1,183 @@
+<?php
+namespace GuzzleHttp\Psr7;
+
+use Psr\Http\Message\StreamInterface;
+
+/**
+ * Trait implementing functionality common to requests and responses.
+ */
+trait MessageTrait
+{
+    /** @var array Map of all registered headers, as original name => array of values */
+    private $headers = [];
+
+    /** @var array Map of lowercase header name => original name at registration */
+    private $headerNames  = [];
+
+    /** @var string */
+    private $protocol = '1.1';
+
+    /** @var StreamInterface */
+    private $stream;
+
+    public function getProtocolVersion()
+    {
+        return $this->protocol;
+    }
+
+    public function withProtocolVersion($version)
+    {
+        if ($this->protocol === $version) {
+            return $this;
+        }
+
+        $new = clone $this;
+        $new->protocol = $version;
+        return $new;
+    }
+
+    public function getHeaders()
+    {
+        return $this->headers;
+    }
+
+    public function hasHeader($header)
+    {
+        return isset($this->headerNames[strtolower($header)]);
+    }
+
+    public function getHeader($header)
+    {
+        $header = strtolower($header);
+
+        if (!isset($this->headerNames[$header])) {
+            return [];
+        }
+
+        $header = $this->headerNames[$header];
+
+        return $this->headers[$header];
+    }
+
+    public function getHeaderLine($header)
+    {
+        return implode(', ', $this->getHeader($header));
+    }
+
+    public function withHeader($header, $value)
+    {
+        if (!is_array($value)) {
+            $value = [$value];
+        }
+
+        $value = $this->trimHeaderValues($value);
+        $normalized = strtolower($header);
+
+        $new = clone $this;
+        if (isset($new->headerNames[$normalized])) {
+            unset($new->headers[$new->headerNames[$normalized]]);
+        }
+        $new->headerNames[$normalized] = $header;
+        $new->headers[$header] = $value;
+
+        return $new;
+    }
+
+    public function withAddedHeader($header, $value)
+    {
+        if (!is_array($value)) {
+            $value = [$value];
+        }
+
+        $value = $this->trimHeaderValues($value);
+        $normalized = strtolower($header);
+
+        $new = clone $this;
+        if (isset($new->headerNames[$normalized])) {
+            $header = $this->headerNames[$normalized];
+            $new->headers[$header] = array_merge($this->headers[$header], $value);
+        } else {
+            $new->headerNames[$normalized] = $header;
+            $new->headers[$header] = $value;
+        }
+
+        return $new;
+    }
+
+    public function withoutHeader($header)
+    {
+        $normalized = strtolower($header);
+
+        if (!isset($this->headerNames[$normalized])) {
+            return $this;
+        }
+
+        $header = $this->headerNames[$normalized];
+
+        $new = clone $this;
+        unset($new->headers[$header], $new->headerNames[$normalized]);
+
+        return $new;
+    }
+
+    public function getBody()
+    {
+        if (!$this->stream) {
+            $this->stream = stream_for('');
+        }
+
+        return $this->stream;
+    }
+
+    public function withBody(StreamInterface $body)
+    {
+        if ($body === $this->stream) {
+            return $this;
+        }
+
+        $new = clone $this;
+        $new->stream = $body;
+        return $new;
+    }
+
+    private function setHeaders(array $headers)
+    {
+        $this->headerNames = $this->headers = [];
+        foreach ($headers as $header => $value) {
+            if (!is_array($value)) {
+                $value = [$value];
+            }
+
+            $value = $this->trimHeaderValues($value);
+            $normalized = strtolower($header);
+            if (isset($this->headerNames[$normalized])) {
+                $header = $this->headerNames[$normalized];
+                $this->headers[$header] = array_merge($this->headers[$header], $value);
+            } else {
+                $this->headerNames[$normalized] = $header;
+                $this->headers[$header] = $value;
+            }
+        }
+    }
+
+    /**
+     * Trims whitespace from the header values.
+     *
+     * Spaces and tabs ought to be excluded by parsers when extracting the field value from a header field.
+     *
+     * header-field = field-name ":" OWS field-value OWS
+     * OWS          = *( SP / HTAB )
+     *
+     * @param string[] $values Header values
+     *
+     * @return string[] Trimmed header values
+     *
+     * @see https://tools.ietf.org/html/rfc7230#section-3.2.4
+     */
+    private function trimHeaderValues(array $values)
+    {
+        return array_map(function ($value) {
+            return trim($value, " \t");
+        }, $values);
+    }
+}
diff --git a/Postman/Postman-Mail/mailgun/vendor/guzzlehttp/psr7/src/MultipartStream.php b/Postman/Postman-Mail/mailgun/vendor/guzzlehttp/psr7/src/MultipartStream.php
new file mode 100644
index 0000000..c0fd584
--- /dev/null
+++ b/Postman/Postman-Mail/mailgun/vendor/guzzlehttp/psr7/src/MultipartStream.php
@@ -0,0 +1,153 @@
+<?php
+namespace GuzzleHttp\Psr7;
+
+use Psr\Http\Message\StreamInterface;
+
+/**
+ * Stream that when read returns bytes for a streaming multipart or
+ * multipart/form-data stream.
+ */
+class MultipartStream implements StreamInterface
+{
+    use StreamDecoratorTrait;
+
+    private $boundary;
+
+    /**
+     * @param array  $elements Array of associative arrays, each containing a
+     *                         required "name" key mapping to the form field,
+     *                         name, a required "contents" key mapping to a
+     *                         StreamInterface/resource/string, an optional
+     *                         "headers" associative array of custom headers,
+     *                         and an optional "filename" key mapping to a
+     *                         string to send as the filename in the part.
+     * @param string $boundary You can optionally provide a specific boundary
+     *
+     * @throws \InvalidArgumentException
+     */
+    public function __construct(array $elements = [], $boundary = null)
+    {
+        $this->boundary = $boundary ?: sha1(uniqid('', true));
+        $this->stream = $this->createStream($elements);
+    }
+
+    /**
+     * Get the boundary
+     *
+     * @return string
+     */
+    public function getBoundary()
+    {
+        return $this->boundary;
+    }
+
+    public function isWritable()
+    {
+        return false;
+    }
+
+    /**
+     * Get the headers needed before transferring the content of a POST file
+     */
+    private function getHeaders(array $headers)
+    {
+        $str = '';
+        foreach ($headers as $key => $value) {
+            $str .= "{$key}: {$value}\r\n";
+        }
+
+        return "--{$this->boundary}\r\n" . trim($str) . "\r\n\r\n";
+    }
+
+    /**
+     * Create the aggregate stream that will be used to upload the POST data
+     */
+    protected function createStream(array $elements)
+    {
+        $stream = new AppendStream();
+
+        foreach ($elements as $element) {
+            $this->addElement($stream, $element);
+        }
+
+        // Add the trailing boundary with CRLF
+        $stream->addStream(stream_for("--{$this->boundary}--\r\n"));
+
+        return $stream;
+    }
+
+    private function addElement(AppendStream $stream, array $element)
+    {
+        foreach (['contents', 'name'] as $key) {
+            if (!array_key_exists($key, $element)) {
+                throw new \InvalidArgumentException("A '{$key}' key is required");
+            }
+        }
+
+        $element['contents'] = stream_for($element['contents']);
+
+        if (empty($element['filename'])) {
+            $uri = $element['contents']->getMetadata('uri');
+            if (substr($uri, 0, 6) !== 'php://') {
+                $element['filename'] = $uri;
+            }
+        }
+
+        list($body, $headers) = $this->createElement(
+            $element['name'],
+            $element['contents'],
+            isset($element['filename']) ? $element['filename'] : null,
+            isset($element['headers']) ? $element['headers'] : []
+        );
+
+        $stream->addStream(stream_for($this->getHeaders($headers)));
+        $stream->addStream($body);
+        $stream->addStream(stream_for("\r\n"));
+    }
+
+    /**
+     * @return array
+     */
+    private function createElement($name, StreamInterface $stream, $filename, array $headers)
+    {
+        // Set a default content-disposition header if one was no provided
+        $disposition = $this->getHeader($headers, 'content-disposition');
+        if (!$disposition) {
+            $headers['Content-Disposition'] = ($filename === '0' || $filename)
+                ? sprintf('form-data; name="%s"; filename="%s"',
+                    $name,
+                    basename($filename))
+                : "form-data; name=\"{$name}\"";
+        }
+
+        // Set a default content-length header if one was no provided
+        $length = $this->getHeader($headers, 'content-length');
+        if (!$length) {
+            if ($length = $stream->getSize()) {
+                $headers['Content-Length'] = (string) $length;
+            }
+        }
+
+        // Set a default Content-Type if one was not supplied
+        $type = $this->getHeader($headers, 'content-type');
+        if (!$type && ($filename === '0' || $filename)) {
+            if ($type = mimetype_from_filename($filename)) {
+                $headers['Content-Type'] = $type;
+            }
+        }
+
+        return [$stream, $headers];
+    }
+
+    private function getHeader(array $headers, $key)
+    {
+        $lowercaseHeader = strtolower($key);
+        foreach ($headers as $k => $v) {
+            if (strtolower($k) === $lowercaseHeader) {
+                return $v;
+            }
+        }
+
+        return null;
+    }
+}
diff --git a/Postman/Postman-Mail/mailgun/vendor/guzzlehttp/psr7/src/NoSeekStream.php b/Postman/Postman-Mail/mailgun/vendor/guzzlehttp/psr7/src/NoSeekStream.php
new file mode 100644
index 0000000..2332218
--- /dev/null
+++ b/Postman/Postman-Mail/mailgun/vendor/guzzlehttp/psr7/src/NoSeekStream.php
@@ -0,0 +1,22 @@
+<?php
+namespace GuzzleHttp\Psr7;
+
+use Psr\Http\Message\StreamInterface;
+
+/**
+ * Stream decorator that prevents a stream from being seeked
+ */
+class NoSeekStream implements StreamInterface
+{
+    use StreamDecoratorTrait;
+
+    public function seek($offset, $whence = SEEK_SET)
+    {
+        throw new \RuntimeException('Cannot seek a NoSeekStream');
+    }
+
+    public function isSeekable()
+    {
+        return false;
+    }
+}
diff --git a/Postman/Postman-Mail/mailgun/vendor/guzzlehttp/psr7/src/PumpStream.php b/Postman/Postman-Mail/mailgun/vendor/guzzlehttp/psr7/src/PumpStream.php
new file mode 100644
index 0000000..ffb5440
--- /dev/null
+++ b/Postman/Postman-Mail/mailgun/vendor/guzzlehttp/psr7/src/PumpStream.php
@@ -0,0 +1,165 @@
+<?php
+namespace GuzzleHttp\Psr7;
+
+use Psr\Http\Message\StreamInterface;
+
+/**
+ * Provides a read only stream that pumps data from a PHP callable.
+ *
+ * When invoking the provided callable, the PumpStream will pass the amount of
+ * data requested to read to the callable. The callable can choose to ignore
+ * this value and return fewer or more bytes than requested. Any extra data
+ * returned by the provided callable is buffered internally until drained using
+ * the read() function of the PumpStream. The provided callable MUST return
+ * false when there is no more data to read.
+ */
+class PumpStream implements StreamInterface
+{
+    /** @var callable */
+    private $source;
+
+    /** @var int */
+    private $size;
+
+    /** @var int */
+    private $tellPos = 0;
+
+    /** @var array */
+    private $metadata;
+
+    /** @var BufferStream */
+    private $buffer;
+
+    /**
+     * @param callable $source Source of the stream data. The callable MAY
+     *                         accept an integer argument used to control the
+     *                         amount of data to return. The callable MUST
+     *                         return a string when called, or false on error
+     *                         or EOF.
+     * @param array $options   Stream options:
+     *                         - metadata: Hash of metadata to use with stream.
+     *                         - size: Size of the stream, if known.
+     */
+    public function __construct(callable $source, array $options = [])
+    {
+        $this->source = $source;
+        $this->size = isset($options['size']) ? $options['size'] : null;
+        $this->metadata = isset($options['metadata']) ? $options['metadata'] : [];
+        $this->buffer = new BufferStream();
+    }
+
+    public function __toString()
+    {
+        try {
+            return copy_to_string($this);
+        } catch (\Exception $e) {
+            return '';
+        }
+    }
+
+    public function close()
+    {
+        $this->detach();
+    }
+
+    public function detach()
+    {
+        $this->tellPos = false;
+        $this->source = null;
+    }
+
+    public function getSize()
+    {
+        return $this->size;
+    }
+
+    public function tell()
+    {
+        return $this->tellPos;
+    }
+
+    public function eof()
+    {
+        return !$this->source;
+    }
+
+    public function isSeekable()
+    {
+        return false;
+    }
+
+    public function rewind()
+    {
+        $this->seek(0);
+    }
+
+    public function seek($offset, $whence = SEEK_SET)
+    {
+        throw new \RuntimeException('Cannot seek a PumpStream');
+    }
+
+    public function isWritable()
+    {
+        return false;
+    }
+
+    public function write($string)
+    {
+        throw new \RuntimeException('Cannot write to a PumpStream');
+    }
+
+    public function isReadable()
+    {
+        return true;
+    }
+
+    public function read($length)
+    {
+        $data = $this->buffer->read($length);
+        $readLen = strlen($data);
+        $this->tellPos += $readLen;
+        $remaining = $length - $readLen;
+
+        if ($remaining) {
+            $this->pump($remaining);
+            $data .= $this->buffer->read($remaining);
+            $this->tellPos += strlen($data) - $readLen;
+        }
+
+        return $data;
+    }
+
+    public function getContents()
+    {
+        $result = '';
+        while (!$this->eof()) {
+            $result .= $this->read(1000000);
+        }
+
+        return $result;
+    }
+
+    public function getMetadata($key = null)
+    {
+        if (!$key) {
+            return $this->metadata;
+        }
+
+        return isset($this->metadata[$key]) ? $this->metadata[$key] : null;
+    }
+
+    private function pump($length)
+    {
+        if ($this->source) {
+            do {
+                $data = call_user_func($this->source, $length);
+                if ($data === false || $data === null) {
+                    $this->source = null;
+                    return;
+                }
+                $this->buffer->write($data);
+                $length -= strlen($data);
+            } while ($length > 0);
+        }
+    }
+}
diff --git a/Postman/Postman-Mail/mailgun/vendor/guzzlehttp/psr7/src/Request.php b/Postman/Postman-Mail/mailgun/vendor/guzzlehttp/psr7/src/Request.php
new file mode 100644
index 0000000..0828548
--- /dev/null
+++ b/Postman/Postman-Mail/mailgun/vendor/guzzlehttp/psr7/src/Request.php
@@ -0,0 +1,142 @@
+<?php
+namespace GuzzleHttp\Psr7;
+
+use InvalidArgumentException;
+use Psr\Http\Message\RequestInterface;
+use Psr\Http\Message\StreamInterface;
+use Psr\Http\Message\UriInterface;
+
+/**
+ * PSR-7 request implementation.
+ */
+class Request implements RequestInterface
+{
+    use MessageTrait;
+
+    /** @var string */
+    private $method;
+
+    /** @var null|string */
+    private $requestTarget;
+
+    /** @var UriInterface */
+    private $uri;
+
+    /**
+     * @param string                               $method  HTTP method
+     * @param string|UriInterface                  $uri     URI
+     * @param array                                $headers Request headers
+     * @param string|null|resource|StreamInterface $body    Request body
+     * @param string                               $version Protocol version
+     */
+    public function __construct(
+        $method,
+        $uri,
+        array $headers = [],
+        $body = null,
+        $version = '1.1'
+    ) {
+        if (!($uri instanceof UriInterface)) {
+            $uri = new Uri($uri);
+        }
+
+        $this->method = strtoupper($method);
+        $this->uri = $uri;
+        $this->setHeaders($headers);
+        $this->protocol = $version;
+
+        if (!$this->hasHeader('Host')) {
+            $this->updateHostFromUri();
+        }
+
+        if ($body !== '' && $body !== null) {
+            $this->stream = stream_for($body);
+        }
+    }
+
+    public function getRequestTarget()
+    {
+        if ($this->requestTarget !== null) {
+            return $this->requestTarget;
+        }
+
+        $target = $this->uri->getPath();
+        if ($target == '') {
+            $target = '/';
+        }
+        if ($this->uri->getQuery() != '') {
+            $target .= '?' . $this->uri->getQuery();
+        }
+
+        return $target;
+    }
+
+    public function withRequestTarget($requestTarget)
+    {
+        if (preg_match('#\s#', $requestTarget)) {
+            throw new InvalidArgumentException(
+                'Invalid request target provided; cannot contain whitespace'
+            );
+        }
+
+        $new = clone $this;
+        $new->requestTarget = $requestTarget;
+        return $new;
+    }
+
+    public function getMethod()
+    {
+        return $this->method;
+    }
+
+    public function withMethod($method)
+    {
+        $new = clone $this;
+        $new->method = strtoupper($method);
+        return $new;
+    }
+
+    public function getUri()
+    {
+        return $this->uri;
+    }
+
+    public function withUri(UriInterface $uri, $preserveHost = false)
+    {
+        if ($uri === $this->uri) {
+            return $this;
+        }
+
+        $new = clone $this;
+        $new->uri = $uri;
+
+        if (!$preserveHost) {
+            $new->updateHostFromUri();
+        }
+
+        return $new;
+    }
+
+    private function updateHostFromUri()
+    {
+        $host = $this->uri->getHost();
+
+        if ($host == '') {
+            return;
+        }
+
+        if (($port = $this->uri->getPort()) !== null) {
+            $host .= ':' . $port;
+        }
+
+        if (isset($this->headerNames['host'])) {
+            $header = $this->headerNames['host'];
+        } else {
+            $header = 'Host';
+            $this->headerNames['host'] = 'Host';
+        }
+        // Ensure Host is the first header.
+        // See: http://tools.ietf.org/html/rfc7230#section-5.4
+        $this->headers = [$header => [$host]] + $this->headers;
+    }
+}
diff --git a/Postman/Postman-Mail/mailgun/vendor/guzzlehttp/psr7/src/Response.php b/Postman/Postman-Mail/mailgun/vendor/guzzlehttp/psr7/src/Response.php
new file mode 100644
index 0000000..2830c6c
--- /dev/null
+++ b/Postman/Postman-Mail/mailgun/vendor/guzzlehttp/psr7/src/Response.php
@@ -0,0 +1,132 @@
+<?php
+namespace GuzzleHttp\Psr7;
+
+use Psr\Http\Message\ResponseInterface;
+use Psr\Http\Message\StreamInterface;
+
+/**
+ * PSR-7 response implementation.
+ */
+class Response implements ResponseInterface
+{
+    use MessageTrait;
+
+    /** @var array Map of standard HTTP status code/reason phrases */
+    private static $phrases = [
+        100 => 'Continue',
+        101 => 'Switching Protocols',
+        102 => 'Processing',
+        200 => 'OK',
+        201 => 'Created',
+        202 => 'Accepted',
+        203 => 'Non-Authoritative Information',
+        204 => 'No Content',
+        205 => 'Reset Content',
+        206 => 'Partial Content',
+        207 => 'Multi-status',
+        208 => 'Already Reported',
+        300 => 'Multiple Choices',
+        301 => 'Moved Permanently',
+        302 => 'Found',
+        303 => 'See Other',
+        304 => 'Not Modified',
+        305 => 'Use Proxy',
+        306 => 'Switch Proxy',
+        307 => 'Temporary Redirect',
+        400 => 'Bad Request',
+        401 => 'Unauthorized',
+        402 => 'Payment Required',
+        403 => 'Forbidden',
+        404 => 'Not Found',
+        405 => 'Method Not Allowed',
+        406 => 'Not Acceptable',
+        407 => 'Proxy Authentication Required',
+        408 => 'Request Time-out',
+        409 => 'Conflict',
+        410 => 'Gone',
+        411 => 'Length Required',
+        412 => 'Precondition Failed',
+        413 => 'Request Entity Too Large',
+        414 => 'Request-URI Too Large',
+        415 => 'Unsupported Media Type',
+        416 => 'Requested range not satisfiable',
+        417 => 'Expectation Failed',
+        418 => 'I\'m a teapot',
+        422 => 'Unprocessable Entity',
+        423 => 'Locked',
+        424 => 'Failed Dependency',
+        425 => 'Unordered Collection',
+        426 => 'Upgrade Required',
+        428 => 'Precondition Required',
+        429 => 'Too Many Requests',
+        431 => 'Request Header Fields Too Large',
+        451 => 'Unavailable For Legal Reasons',
+        500 => 'Internal Server Error',
+        501 => 'Not Implemented',
+        502 => 'Bad Gateway',
+        503 => 'Service Unavailable',
+        504 => 'Gateway Time-out',
+        505 => 'HTTP Version not supported',
+        506 => 'Variant Also Negotiates',
+        507 => 'Insufficient Storage',
+        508 => 'Loop Detected',
+        511 => 'Network Authentication Required',
+    ];
+
+    /** @var string */
+    private $reasonPhrase = '';
+
+    /** @var int */
+    private $statusCode = 200;
+
+    /**
+     * @param int                                  $status  Status code
+     * @param array                                $headers Response headers
+     * @param string|null|resource|StreamInterface $body    Response body
+     * @param string                               $version Protocol version
+     * @param string|null                          $reason  Reason phrase (when empty a default will be used based on the status code)
+     */
+    public function __construct(
+        $status = 200,
+        array $headers = [],
+        $body = null,
+        $version = '1.1',
+        $reason = null
+    ) {
+        $this->statusCode = (int) $status;
+
+        if ($body !== '' && $body !== null) {
+            $this->stream = stream_for($body);
+        }
+
+        $this->setHeaders($headers);
+        if ($reason == '' && isset(self::$phrases[$this->statusCode])) {
+            $this->reasonPhrase = self::$phrases[$this->statusCode];
+        } else {
+            $this->reasonPhrase = (string) $reason;
+        }
+
+        $this->protocol = $version;
+    }
+
+    public function getStatusCode()
+    {
+        return $this->statusCode;
+    }
+
+    public function getReasonPhrase()
+    {
+        return $this->reasonPhrase;
+    }
+
+    public function withStatus($code, $reasonPhrase = '')
+    {
+        $new = clone $this;
+        $new->statusCode = (int) $code;
+        if ($reasonPhrase == '' && isset(self::$phrases[$new->statusCode])) {
+            $reasonPhrase = self::$phrases[$new->statusCode];
+        }
+        $new->reasonPhrase = $reasonPhrase;
+        return $new;
+    }
+}
diff --git a/Postman/Postman-Mail/mailgun/vendor/guzzlehttp/psr7/src/ServerRequest.php b/Postman/Postman-Mail/mailgun/vendor/guzzlehttp/psr7/src/ServerRequest.php
new file mode 100644
index 0000000..575aab8
--- /dev/null
+++ b/Postman/Postman-Mail/mailgun/vendor/guzzlehttp/psr7/src/ServerRequest.php
@@ -0,0 +1,358 @@
+<?php
+
+namespace GuzzleHttp\Psr7;
+
+use InvalidArgumentException;
+use Psr\Http\Message\ServerRequestInterface;
+use Psr\Http\Message\UriInterface;
+use Psr\Http\Message\StreamInterface;
+use Psr\Http\Message\UploadedFileInterface;
+
+/**
+ * Server-side HTTP request
+ *
+ * Extends the Request definition to add methods for accessing incoming data,
+ * specifically server parameters, cookies, matched path parameters, query
+ * string arguments, body parameters, and upload file information.
+ *
+ * "Attributes" are discovered via decomposing the request (and usually
+ * specifically the URI path), and typically will be injected by the application.
+ *
+ * Requests are considered immutable; all methods that might change state are
+ * implemented such that they retain the internal state of the current
+ * message and return a new instance that contains the changed state.
+ */
+class ServerRequest extends Request implements ServerRequestInterface
+{
+    /**
+     * @var array
+     */
+    private $attributes = [];
+
+    /**
+     * @var array
+     */
+    private $cookieParams = [];
+
+    /**
+     * @var null|array|object
+     */
+    private $parsedBody;
+
+    /**
+     * @var array
+     */
+    private $queryParams = [];
+
+    /**
+     * @var array
+     */
+    private $serverParams;
+
+    /**
+     * @var array
+     */
+    private $uploadedFiles = [];
+
+    /**
+     * @param string                               $method       HTTP method
+     * @param string|UriInterface                  $uri          URI
+     * @param array                                $headers      Request headers
+     * @param string|null|resource|StreamInterface $body         Request body
+     * @param string                               $version      Protocol version
+     * @param array                                $serverParams Typically the $_SERVER superglobal
+     */
+    public function __construct(
+        $method,
+        $uri,
+        array $headers = [],
+        $body = null,
+        $version = '1.1',
+        array $serverParams = []
+    ) {
+        $this->serverParams = $serverParams;
+
+        parent::__construct($method, $uri, $headers, $body, $version);
+    }
+
+    /**
+     * Return an UploadedFile instance array.
+     *
+     * @param array $files A array which respect $_FILES structure
+     * @throws InvalidArgumentException for unrecognized values
+     * @return array
+     */
+    public static function normalizeFiles(array $files)
+    {
+        $normalized = [];
+
+        foreach ($files as $key => $value) {
+            if ($value instanceof UploadedFileInterface) {
+                $normalized[$key] = $value;
+            } elseif (is_array($value) && isset($value['tmp_name'])) {
+                $normalized[$key] = self::createUploadedFileFromSpec($value);
+            } elseif (is_array($value)) {
+                $normalized[$key] = self::normalizeFiles($value);
+                continue;
+            } else {
+                throw new InvalidArgumentException('Invalid value in files specification');
+            }
+        }
+
+        return $normalized;
+    }
+
+    /**
+     * Create and return an UploadedFile instance from a $_FILES specification.
+     *
+     * If the specification represents an array of values, this method will
+     * delegate to normalizeNestedFileSpec() and return that return value.
+     *
+     * @param array $value $_FILES struct
+     * @return array|UploadedFileInterface
+     */
+    private static function createUploadedFileFromSpec(array $value)
+    {
+        if (is_array($value['tmp_name'])) {
+            return self::normalizeNestedFileSpec($value);
+        }
+
+        return new UploadedFile(
+            $value['tmp_name'],
+            (int) $value['size'],
+            (int) $value['error'],
+            $value['name'],
+            $value['type']
+        );
+    }
+
+    /**
+     * Normalize an array of file specifications.
+     *
+     * Loops through all nested files and returns a normalized array of
+     * UploadedFileInterface instances.
+     *
+     * @param array $files
+     * @return UploadedFileInterface[]
+     */
+    private static function normalizeNestedFileSpec(array $files = [])
+    {
+        $normalizedFiles = [];
+
+        foreach (array_keys($files['tmp_name']) as $key) {
+            $spec = [
+                'tmp_name' => $files['tmp_name'][$key],
+                'size'     => $files['size'][$key],
+                'error'    => $files['error'][$key],
+                'name'     => $files['name'][$key],
+                'type'     => $files['type'][$key],
+            ];
+            $normalizedFiles[$key] = self::createUploadedFileFromSpec($spec);
+        }
+
+        return $normalizedFiles;
+    }
+
+    /**
+     * Return a ServerRequest populated with superglobals:
+     * $_GET
+     * $_POST
+     * $_COOKIE
+     * $_FILES
+     * $_SERVER
+     *
+     * @return ServerRequestInterface
+     */
+    public static function fromGlobals()
+    {
+        $method = isset($_SERVER['REQUEST_METHOD']) ? $_SERVER['REQUEST_METHOD'] : 'GET';
+        $headers = function_exists('getallheaders') ? getallheaders() : [];
+        $uri = self::getUriFromGlobals();
+        $body = new LazyOpenStream('php://input', 'r+');
+        $protocol = isset($_SERVER['SERVER_PROTOCOL']) ? str_replace('HTTP/', '', $_SERVER['SERVER_PROTOCOL']) : '1.1';
+
+        $serverRequest = new ServerRequest($method, $uri, $headers, $body, $protocol, $_SERVER);
+
+        return $serverRequest
+            ->withCookieParams($_COOKIE)
+            ->withQueryParams($_GET)
+            ->withParsedBody($_POST)
+            ->withUploadedFiles(self::normalizeFiles($_FILES));
+    }
+
+    /**
+     * Get a Uri populated with values from $_SERVER.
+     *
+     * @return UriInterface
+     */
+    public static function getUriFromGlobals() {
+        $uri = new Uri('');
+
+        $uri = $uri->withScheme(!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] !== 'off' ? 'https' : 'http');
+
+        $hasPort = false;
+        if (isset($_SERVER['HTTP_HOST'])) {
+            $hostHeaderParts = explode(':', $_SERVER['HTTP_HOST']);
+            $uri = $uri->withHost($hostHeaderParts[0]);
+            if (isset($hostHeaderParts[1])) {
+                $hasPort = true;
+                $uri = $uri->withPort($hostHeaderParts[1]);
+            }
+        } elseif (isset($_SERVER['SERVER_NAME'])) {
+            $uri = $uri->withHost($_SERVER['SERVER_NAME']);
+        } elseif (isset($_SERVER['SERVER_ADDR'])) {
+            $uri = $uri->withHost($_SERVER['SERVER_ADDR']);
+        }
+
+        if (!$hasPort && isset($_SERVER['SERVER_PORT'])) {
+            $uri = $uri->withPort($_SERVER['SERVER_PORT']);
+        }
+
+        $hasQuery = false;
+        if (isset($_SERVER['REQUEST_URI'])) {
+            $requestUriParts = explode('?', $_SERVER['REQUEST_URI']);
+            $uri = $uri->withPath($requestUriParts[0]);
+            if (isset($requestUriParts[1])) {
+                $hasQuery = true;
+                $uri = $uri->withQuery($requestUriParts[1]);
+            }
+        }
+
+        if (!$hasQuery && isset($_SERVER['QUERY_STRING'])) {
+            $uri = $uri->withQuery($_SERVER['QUERY_STRING']);
+        }
+
+        return $uri;
+    }
+
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getServerParams()
+    {
+        return $this->serverParams;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getUploadedFiles()
+    {
+        return $this->uploadedFiles;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function withUploadedFiles(array $uploadedFiles)
+    {
+        $new = clone $this;
+        $new->uploadedFiles = $uploadedFiles;
+
+        return $new;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getCookieParams()
+    {
+        return $this->cookieParams;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function withCookieParams(array $cookies)
+    {
+        $new = clone $this;
+        $new->cookieParams = $cookies;
+
+        return $new;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getQueryParams()
+    {
+        return $this->queryParams;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function withQueryParams(array $query)
+    {
+        $new = clone $this;
+        $new->queryParams = $query;
+
+        return $new;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getParsedBody()
+    {
+        return $this->parsedBody;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function withParsedBody($data)
+    {
+        $new = clone $this;
+        $new->parsedBody = $data;
+
+        return $new;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getAttributes()
+    {
+        return $this->attributes;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getAttribute($attribute, $default = null)
+    {
+        if (false === array_key_exists($attribute, $this->attributes)) {
+            return $default;
+        }
+
+        return $this->attributes[$attribute];
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function withAttribute($attribute, $value)
+    {
+        $new = clone $this;
+        $new->attributes[$attribute] = $value;
+
+        return $new;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function withoutAttribute($attribute)
+    {
+        if (false === array_key_exists($attribute, $this->attributes)) {
+            return $this;
+        }
+
+        $new = clone $this;
+        unset($new->attributes[$attribute]);
+
+        return $new;
+    }
+}
diff --git a/Postman/Postman-Mail/mailgun/vendor/guzzlehttp/psr7/src/Stream.php b/Postman/Postman-Mail/mailgun/vendor/guzzlehttp/psr7/src/Stream.php
new file mode 100644
index 0000000..e336628
--- /dev/null
+++ b/Postman/Postman-Mail/mailgun/vendor/guzzlehttp/psr7/src/Stream.php
@@ -0,0 +1,257 @@
+<?php
+namespace GuzzleHttp\Psr7;
+
+use Psr\Http\Message\StreamInterface;
+
+/**
+ * PHP stream implementation.
+ *
+ * @var $stream
+ */
+class Stream implements StreamInterface
+{
+    private $stream;
+    private $size;
+    private $seekable;
+    private $readable;
+    private $writable;
+    private $uri;
+    private $customMetadata;
+
+    /** @var array Hash of readable and writable stream types */
+    private static $readWriteHash = [
+        'read' => [
+            'r' => true, 'w+' => true, 'r+' => true, 'x+' => true, 'c+' => true,
+            'rb' => true, 'w+b' => true, 'r+b' => true, 'x+b' => true,
+            'c+b' => true, 'rt' => true, 'w+t' => true, 'r+t' => true,
+            'x+t' => true, 'c+t' => true, 'a+' => true
+        ],
+        'write' => [
+            'w' => true, 'w+' => true, 'rw' => true, 'r+' => true, 'x+' => true,
+            'c+' => true, 'wb' => true, 'w+b' => true, 'r+b' => true,
+            'x+b' => true, 'c+b' => true, 'w+t' => true, 'r+t' => true,
+            'x+t' => true, 'c+t' => true, 'a' => true, 'a+' => true
+        ]
+    ];
+
+    /**
+     * This constructor accepts an associative array of options.
+     *
+     * - size: (int) If a read stream would otherwise have an indeterminate
+     *   size, but the size is known due to foreknowledge, then you can
+     *   provide that size, in bytes.
+     * - metadata: (array) Any additional metadata to return when the metadata
+     *   of the stream is accessed.
+     *
+     * @param resource $stream  Stream resource to wrap.
+     * @param array    $options Associative array of options.
+     *
+     * @throws \InvalidArgumentException if the stream is not a stream resource
+     */
+    public function __construct($stream, $options = [])
+    {
+        if (!is_resource($stream)) {
+            throw new \InvalidArgumentException('Stream must be a resource');
+        }
+
+        if (isset($options['size'])) {
+            $this->size = $options['size'];
+        }
+
+        $this->customMetadata = isset($options['metadata'])
+            ? $options['metadata']
+            : [];
+
+        $this->stream = $stream;
+        $meta = stream_get_meta_data($this->stream);
+        $this->seekable = $meta['seekable'];
+        $this->readable = isset(self::$readWriteHash['read'][$meta['mode']]);
+        $this->writable = isset(self::$readWriteHash['write'][$meta['mode']]);
+        $this->uri = $this->getMetadata('uri');
+    }
+
+    public function __get($name)
+    {
+        if ($name == 'stream') {
+            throw new \RuntimeException('The stream is detached');
+        }
+
+        throw new \BadMethodCallException('No value for ' . $name);
+    }
+
+    /**
+     * Closes the stream when the destructed
+     */
+    public function __destruct()
+    {
+        $this->close();
+    }
+
+    public function __toString()
+    {
+        try {
+            $this->seek(0);
+            return (string) stream_get_contents($this->stream);
+        } catch (\Exception $e) {
+            return '';
+        }
+    }
+
+    public function getContents()
+    {
+        $contents = stream_get_contents($this->stream);
+
+        if ($contents === false) {
+            throw new \RuntimeException('Unable to read stream contents');
+        }
+
+        return $contents;
+    }
+
+    public function close()
+    {
+        if (isset($this->stream)) {
+            if (is_resource($this->stream)) {
+                fclose($this->stream);
+            }
+            $this->detach();
+        }
+    }
+
+    public function detach()
+    {
+        if (!isset($this->stream)) {
+            return null;
+        }
+
+        $result = $this->stream;
+        unset($this->stream);
+        $this->size = $this->uri = null;
+        $this->readable = $this->writable = $this->seekable = false;
+
+        return $result;
+    }
+
+    public function getSize()
+    {
+        if ($this->size !== null) {
+            return $this->size;
+        }
+
+        if (!isset($this->stream)) {
+            return null;
+        }
+
+        // Clear the stat cache if the stream has a URI
+        if ($this->uri) {
+            clearstatcache(true, $this->uri);
+        }
+
+        $stats = fstat($this->stream);
+        if (isset($stats['size'])) {
+            $this->size = $stats['size'];
+            return $this->size;
+        }
+
+        return null;
+    }
+
+    public function isReadable()
+    {
+        return $this->readable;
+    }
+
+    public function isWritable()
+    {
+        return $this->writable;
+    }
+
+    public function isSeekable()
+    {
+        return $this->seekable;
+    }
+
+    public function eof()
+    {
+        return !$this->stream || feof($this->stream);
+    }
+
+    public function tell()
+    {
+        $result = ftell($this->stream);
+
+        if ($result === false) {
+            throw new \RuntimeException('Unable to determine stream position');
+        }
+
+        return $result;
+    }
+
+    public function rewind()
+    {
+        $this->seek(0);
+    }
+
+    public function seek($offset, $whence = SEEK_SET)
+    {
+        if (!$this->seekable) {
+            throw new \RuntimeException('Stream is not seekable');
+        } elseif (fseek($this->stream, $offset, $whence) === -1) {
+            throw new \RuntimeException('Unable to seek to stream position '
+                . $offset . ' with whence ' . var_export($whence, true));
+        }
+    }
+
+    public function read($length)
+    {
+        if (!$this->readable) {
+            throw new \RuntimeException('Cannot read from non-readable stream');
+        }
+        if ($length < 0) {
+            throw new \RuntimeException('Length parameter cannot be negative');
+        }
+
+        if (0 === $length) {
+            return '';
+        }
+
+        $string = fread($this->stream, $length);
+        if (false === $string) {
+            throw new \RuntimeException('Unable to read from stream');
+        }
+
+        return $string;
+    }
+
+    public function write($string)
+    {
+        if (!$this->writable) {
+            throw new \RuntimeException('Cannot write to a non-writable stream');
+        }
+
+        // We can't know the size after writing anything
+        $this->size = null;
+        $result = fwrite($this->stream, $string);
+
+        if ($result === false) {
+            throw new \RuntimeException('Unable to write to stream');
+        }
+
+        return $result;
+    }
+
+    public function getMetadata($key = null)
+    {
+        if (!isset($this->stream)) {
+            return $key ? null : [];
+        } elseif (!$key) {
+            return $this->customMetadata + stream_get_meta_data($this->stream);
+        } elseif (isset($this->customMetadata[$key])) {
+            return $this->customMetadata[$key];
+        }
+
+        $meta = stream_get_meta_data($this->stream);
+
+        return isset($meta[$key]) ? $meta[$key] : null;
+    }
+}
diff --git a/Postman/Postman-Mail/mailgun/vendor/guzzlehttp/psr7/src/StreamDecoratorTrait.php b/Postman/Postman-Mail/mailgun/vendor/guzzlehttp/psr7/src/StreamDecoratorTrait.php
new file mode 100644
index 0000000..daec6f5
--- /dev/null
+++ b/Postman/Postman-Mail/mailgun/vendor/guzzlehttp/psr7/src/StreamDecoratorTrait.php
@@ -0,0 +1,149 @@
+<?php
+namespace GuzzleHttp\Psr7;
+
+use Psr\Http\Message\StreamInterface;
+
+/**
+ * Stream decorator trait
+ * @property StreamInterface stream
+ */
+trait StreamDecoratorTrait
+{
+    /**
+     * @param StreamInterface $stream Stream to decorate
+     */
+    public function __construct(StreamInterface $stream)
+    {
+        $this->stream = $stream;
+    }
+
+    /**
+     * Magic method used to create a new stream if streams are not added in
+     * the constructor of a decorator (e.g., LazyOpenStream).
+     *
+     * @param string $name Name of the property (allows "stream" only).
+     *
+     * @return StreamInterface
+     */
+    public function __get($name)
+    {
+        if ($name == 'stream') {
+            $this->stream = $this->createStream();
+            return $this->stream;
+        }
+
+        throw new \UnexpectedValueException("$name not found on class");
+    }
+
+    public function __toString()
+    {
+        try {
+            if ($this->isSeekable()) {
+                $this->seek(0);
+            }
+            return $this->getContents();
+        } catch (\Exception $e) {
+            // Really, PHP? https://bugs.php.net/bug.php?id=53648
+            trigger_error('StreamDecorator::__toString exception: '
+                . (string) $e, E_USER_ERROR);
+            return '';
+        }
+    }
+
+    public function getContents()
+    {
+        return copy_to_string($this);
+    }
+
+    /**
+     * Allow decorators to implement custom methods
+     *
+     * @param string $method Missing method name
+     * @param array  $args   Method arguments
+     *
+     * @return mixed
+     */
+    public function __call($method, array $args)
+    {
+        $result = call_user_func_array([$this->stream, $method], $args);
+
+        // Always return the wrapped object if the result is a return $this
+        return $result === $this->stream ? $this : $result;
+    }
+
+    public function close()
+    {
+        $this->stream->close();
+    }
+
+    public function getMetadata($key = null)
+    {
+        return $this->stream->getMetadata($key);
+    }
+
+    public function detach()
+    {
+        return $this->stream->detach();
+    }
+
+    public function getSize()
+    {
+        return $this->stream->getSize();
+    }
+
+    public function eof()
+    {
+        return $this->stream->eof();
+    }
+
+    public function tell()
+    {
+        return $this->stream->tell();
+    }
+
+    public function isReadable()
+    {
+        return $this->stream->isReadable();
+    }
+
+    public function isWritable()
+    {
+        return $this->stream->isWritable();
+    }
+
+    public function isSeekable()
+    {
+        return $this->stream->isSeekable();
+    }
+
+    public function rewind()
+    {
+        $this->seek(0);
+    }
+
+    public function seek($offset, $whence = SEEK_SET)
+    {
+        $this->stream->seek($offset, $whence);
+    }
+
+    public function read($length)
+    {
+        return $this->stream->read($length);
+    }
+
+    public function write($string)
+    {
+        return $this->stream->write($string);
+    }
+
+    /**
+     * Implement in subclasses to dynamically create streams when requested.
+     *
+     * @return StreamInterface
+     * @throws \BadMethodCallException
+     */
+    protected function createStream()
+    {
+        throw new \BadMethodCallException('Not implemented');
+    }
+}
diff --git a/Postman/Postman-Mail/mailgun/vendor/guzzlehttp/psr7/src/StreamWrapper.php b/Postman/Postman-Mail/mailgun/vendor/guzzlehttp/psr7/src/StreamWrapper.php
new file mode 100644
index 0000000..cf7b223
--- /dev/null
+++ b/Postman/Postman-Mail/mailgun/vendor/guzzlehttp/psr7/src/StreamWrapper.php
@@ -0,0 +1,121 @@
+<?php
+namespace GuzzleHttp\Psr7;
+
+use Psr\Http\Message\StreamInterface;
+
+/**
+ * Converts Guzzle streams into PHP stream resources.
+ */
+class StreamWrapper
+{
+    /** @var resource */
+    public $context;
+
+    /** @var StreamInterface */
+    private $stream;
+
+    /** @var string r, r+, or w */
+    private $mode;
+
+    /**
+     * Returns a resource representing the stream.
+     *
+     * @param StreamInterface $stream The stream to get a resource for
+     *
+     * @return resource
+     * @throws \InvalidArgumentException if stream is not readable or writable
+     */
+    public static function getResource(StreamInterface $stream)
+    {
+        self::register();
+
+        if ($stream->isReadable()) {
+            $mode = $stream->isWritable() ? 'r+' : 'r';
+        } elseif ($stream->isWritable()) {
+            $mode = 'w';
+        } else {
+            throw new \InvalidArgumentException('The stream must be readable, '
+                . 'writable, or both.');
+        }
+
+        return fopen('guzzle://stream', $mode, null, stream_context_create([
+            'guzzle' => ['stream' => $stream]
+        ]));
+    }
+
+    /**
+     * Registers the stream wrapper if needed
+     */
+    public static function register()
+    {
+        if (!in_array('guzzle', stream_get_wrappers())) {
+            stream_wrapper_register('guzzle', __CLASS__);
+        }
+    }
+
+    public function stream_open($path, $mode, $options, &$opened_path)
+    {
+        $options = stream_context_get_options($this->context);
+
+        if (!isset($options['guzzle']['stream'])) {
+            return false;
+        }
+
+        $this->mode = $mode;
+        $this->stream = $options['guzzle']['stream'];
+
+        return true;
+    }
+
+    public function stream_read($count)
+    {
+        return $this->stream->read($count);
+    }
+
+    public function stream_write($data)
+    {
+        return (int) $this->stream->write($data);
+    }
+
+    public function stream_tell()
+    {
+        return $this->stream->tell();
+    }
+
+    public function stream_eof()
+    {
+        return $this->stream->eof();
+    }
+
+    public function stream_seek($offset, $whence)
+    {
+        $this->stream->seek($offset, $whence);
+
+        return true;
+    }
+
+    public function stream_stat()
+    {
+        static $modeMap = [
+            'r'  => 33060,
+            'r+' => 33206,
+            'w'  => 33188
+        ];
+
+        return [
+            'dev'     => 0,
+            'ino'     => 0,
+            'mode'    => $modeMap[$this->mode],
+            'nlink'   => 0,
+            'uid'     => 0,
+            'gid'     => 0,
+            'rdev'    => 0,
+            'size'    => $this->stream->getSize() ?: 0,
+            'atime'   => 0,
+            'mtime'   => 0,
+            'ctime'   => 0,
+            'blksize' => 0,
+            'blocks'  => 0
+        ];
+    }
+}
diff --git a/Postman/Postman-Mail/mailgun/vendor/guzzlehttp/psr7/src/UploadedFile.php b/Postman/Postman-Mail/mailgun/vendor/guzzlehttp/psr7/src/UploadedFile.php
new file mode 100644
index 0000000..e62bd5c
--- /dev/null
+++ b/Postman/Postman-Mail/mailgun/vendor/guzzlehttp/psr7/src/UploadedFile.php
@@ -0,0 +1,316 @@
+<?php
+namespace GuzzleHttp\Psr7;
+
+use InvalidArgumentException;
+use Psr\Http\Message\StreamInterface;
+use Psr\Http\Message\UploadedFileInterface;
+use RuntimeException;
+
+class UploadedFile implements UploadedFileInterface
+{
+    /**
+     * @var int[]
+     */
+    private static $errors = [
+        UPLOAD_ERR_OK,
+        UPLOAD_ERR_INI_SIZE,
+        UPLOAD_ERR_FORM_SIZE,
+        UPLOAD_ERR_PARTIAL,
+        UPLOAD_ERR_NO_FILE,
+        UPLOAD_ERR_NO_TMP_DIR,
+        UPLOAD_ERR_CANT_WRITE,
+        UPLOAD_ERR_EXTENSION,
+    ];
+
+    /**
+     * @var string
+     */
+    private $clientFilename;
+
+    /**
+     * @var string
+     */
+    private $clientMediaType;
+
+    /**
+     * @var int
+     */
+    private $error;
+
+    /**
+     * @var null|string
+     */
+    private $file;
+
+    /**
+     * @var bool
+     */
+    private $moved = false;
+
+    /**
+     * @var int
+     */
+    private $size;
+
+    /**
+     * @var StreamInterface|null
+     */
+    private $stream;
+
+    /**
+     * @param StreamInterface|string|resource $streamOrFile
+     * @param int $size
+     * @param int $errorStatus
+     * @param string|null $clientFilename
+     * @param string|null $clientMediaType
+     */
+    public function __construct(
+        $streamOrFile,
+        $size,
+        $errorStatus,
+        $clientFilename = null,
+        $clientMediaType = null
+    ) {
+        $this->setError($errorStatus);
+        $this->setSize($size);
+        $this->setClientFilename($clientFilename);
+        $this->setClientMediaType($clientMediaType);
+
+        if ($this->isOk()) {
+            $this->setStreamOrFile($streamOrFile);
+        }
+    }
+
+    /**
+     * Depending on the value set file or stream variable
+     *
+     * @param mixed $streamOrFile
+     * @throws InvalidArgumentException
+     */
+    private function setStreamOrFile($streamOrFile)
+    {
+        if (is_string($streamOrFile)) {
+            $this->file = $streamOrFile;
+        } elseif (is_resource($streamOrFile)) {
+            $this->stream = new Stream($streamOrFile);
+        } elseif ($streamOrFile instanceof StreamInterface) {
+            $this->stream = $streamOrFile;
+        } else {
+            throw new InvalidArgumentException(
+                'Invalid stream or file provided for UploadedFile'
+            );
+        }
+    }
+
+    /**
+     * @param int $error
+     * @throws InvalidArgumentException
+     */
+    private function setError($error)
+    {
+        if (false === is_int($error)) {
+            throw new InvalidArgumentException(
+                'Upload file error status must be an integer'
+            );
+        }
+
+        if (false === in_array($error, UploadedFile::$errors)) {
+            throw new InvalidArgumentException(
+                'Invalid error status for UploadedFile'
+            );
+        }
+
+        $this->error = $error;
+    }
+
+    /**
+     * @param int $size
+     * @throws InvalidArgumentException
+     */
+    private function setSize($size)
+    {
+        if (false === is_int($size)) {
+            throw new InvalidArgumentException(
+                'Upload file size must be an integer'
+            );
+        }
+
+        $this->size = $size;
+    }
+
+    /**
+     * @param mixed $param
+     * @return boolean
+     */
+    private function isStringOrNull($param)
+    {
+        return in_array(gettype($param), ['string', 'NULL']);
+    }
+
+    /**
+     * @param mixed $param
+     * @return boolean
+     */
+    private function isStringNotEmpty($param)
+    {
+        return is_string($param) && false === empty($param);
+    }
+
+    /**
+     * @param string|null $clientFilename
+     * @throws InvalidArgumentException
+     */
+    private function setClientFilename($clientFilename)
+    {
+        if (false === $this->isStringOrNull($clientFilename)) {
+            throw new InvalidArgumentException(
+                'Upload file client filename must be a string or null'
+            );
+        }
+
+        $this->clientFilename = $clientFilename;
+    }
+
+    /**
+     * @param string|null $clientMediaType
+     * @throws InvalidArgumentException
+     */
+    private function setClientMediaType($clientMediaType)
+    {
+        if (false === $this->isStringOrNull($clientMediaType)) {
+            throw new InvalidArgumentException(
+                'Upload file client media type must be a string or null'
+            );
+        }
+
+        $this->clientMediaType = $clientMediaType;
+    }
+
+    /**
+     * Return true if there is no upload error
+     *
+     * @return boolean
+     */
+    private function isOk()
+    {
+        return $this->error === UPLOAD_ERR_OK;
+    }
+
+    /**
+     * @return boolean
+     */
+    public function isMoved()
+    {
+        return $this->moved;
+    }
+
+    /**
+     * @throws RuntimeException if is moved or not ok
+     */
+    private function validateActive()
+    {
+        if (false === $this->isOk()) {
+            throw new RuntimeException('Cannot retrieve stream due to upload error');
+        }
+
+        if ($this->isMoved()) {
+            throw new RuntimeException('Cannot retrieve stream after it has already been moved');
+        }
+    }
+
+    /**
+     * {@inheritdoc}
+     * @throws RuntimeException if the upload was not successful.
+     */
+    public function getStream()
+    {
+        $this->validateActive();
+
+        if ($this->stream instanceof StreamInterface) {
+            return $this->stream;
+        }
+
+        return new LazyOpenStream($this->file, 'r+');
+    }
+
+    /**
+     * {@inheritdoc}
+     *
+     * @see http://php.net/is_uploaded_file
+     * @see http://php.net/move_uploaded_file
+     * @param string $targetPath Path to which to move the uploaded file.
+     * @throws RuntimeException if the upload was not successful.
+     * @throws InvalidArgumentException if the $path specified is invalid.
+     * @throws RuntimeException on any error during the move operation, or on
+     *     the second or subsequent call to the method.
+     */
+    public function moveTo($targetPath)
+    {
+        $this->validateActive();
+
+        if (false === $this->isStringNotEmpty($targetPath)) {
+            throw new InvalidArgumentException(
+                'Invalid path provided for move operation; must be a non-empty string'
+            );
+        }
+
+        if ($this->file) {
+            $this->moved = php_sapi_name() == 'cli'
+                ? rename($this->file, $targetPath)
+                : move_uploaded_file($this->file, $targetPath);
+        } else {
+            copy_to_stream(
+                $this->getStream(),
+                new LazyOpenStream($targetPath, 'w')
+            );
+
+            $this->moved = true;
+        }
+
+        if (false === $this->moved) {
+            throw new RuntimeException(
+                sprintf('Uploaded file could not be moved to %s', $targetPath)
+            );
+        }
+    }
+
+    /**
+     * {@inheritdoc}
+     *
+     * @return int|null The file size in bytes or null if unknown.
+     */
+    public function getSize()
+    {
+        return $this->size;
+    }
+
+    /**
+     * {@inheritdoc}
+     *
+     * @see http://php.net/manual/en/features.file-upload.errors.php
+     * @return int One of PHP's UPLOAD_ERR_XXX constants.
+     */
+    public function getError()
+    {
+        return $this->error;
+    }
+
+    /**
+     * {@inheritdoc}
+     *
+     * @return string|null The filename sent by the client or null if none
+     *     was provided.
+     */
+    public function getClientFilename()
+    {
+        return $this->clientFilename;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getClientMediaType()
+    {
+        return $this->clientMediaType;
+    }
+}
diff --git a/Postman/Postman-Mail/mailgun/vendor/guzzlehttp/psr7/src/Uri.php b/Postman/Postman-Mail/mailgun/vendor/guzzlehttp/psr7/src/Uri.php
new file mode 100644
index 0000000..f46c1db
--- /dev/null
+++ b/Postman/Postman-Mail/mailgun/vendor/guzzlehttp/psr7/src/Uri.php
@@ -0,0 +1,702 @@
+<?php
+namespace GuzzleHttp\Psr7;
+
+use Psr\Http\Message\UriInterface;
+
+/**
+ * PSR-7 URI implementation.
+ *
+ * @author Michael Dowling
+ * @author Tobias Schultze
+ * @author Matthew Weier O'Phinney
+ */
+class Uri implements UriInterface
+{
+    /**
+     * Absolute http and https URIs require a host per RFC 7230 Section 2.7
+     * but in generic URIs the host can be empty. So for http(s) URIs
+     * we apply this default host when no host is given yet to form a
+     * valid URI.
+     */
+    const HTTP_DEFAULT_HOST = 'localhost';
+
+    private static $defaultPorts = [
+        'http'  => 80,
+        'https' => 443,
+        'ftp' => 21,
+        'gopher' => 70,
+        'nntp' => 119,
+        'news' => 119,
+        'telnet' => 23,
+        'tn3270' => 23,
+        'imap' => 143,
+        'pop' => 110,
+        'ldap' => 389,
+    ];
+
+    private static $charUnreserved = 'a-zA-Z0-9_\-\.~';
+    private static $charSubDelims = '!\$&\'\(\)\*\+,;=';
+    private static $replaceQuery = ['=' => '%3D', '&' => '%26'];
+
+    /** @var string Uri scheme. */
+    private $scheme = '';
+
+    /** @var string Uri user info. */
+    private $userInfo = '';
+
+    /** @var string Uri host. */
+    private $host = '';
+
+    /** @var int|null Uri port. */
+    private $port;
+
+    /** @var string Uri path. */
+    private $path = '';
+
+    /** @var string Uri query string. */
+    private $query = '';
+
+    /** @var string Uri fragment. */
+    private $fragment = '';
+
+    /**
+     * @param string $uri URI to parse
+     */
+    public function __construct($uri = '')
+    {
+        // weak type check to also accept null until we can add scalar type hints
+        if ($uri != '') {
+            $parts = parse_url($uri);
+            if ($parts === false) {
+                throw new \InvalidArgumentException("Unable to parse URI: $uri");
+            }
+            $this->applyParts($parts);
+        }
+    }
+
+    public function __toString()
+    {
+        return self::composeComponents(
+            $this->scheme,
+            $this->getAuthority(),
+            $this->path,
+            $this->query,
+            $this->fragment
+        );
+    }
+
+    /**
+     * Composes a URI reference string from its various components.
+     *
+     * Usually this method does not need to be called manually but instead is used indirectly via
+     * `Psr\Http\Message\UriInterface::__toString`.
+     *
+     * PSR-7 UriInterface treats an empty component the same as a missing component as
+     * getQuery(), getFragment() etc. always return a string. This explains the slight
+     * difference to RFC 3986 Section 5.3.
+     *
+     * Another adjustment is that the authority separator is added even when the authority is missing/empty
+     * for the "file" scheme. This is because PHP stream functions like `file_get_contents` only work with
+     * `file:///myfile` but not with `file:/myfile` although they are equivalent according to RFC 3986. But
+     * `file:///` is the more common syntax for the file scheme anyway (Chrome for example redirects to
+     * that format).
+     *
+     * @param string $scheme
+     * @param string $authority
+     * @param string $path
+     * @param string $query
+     * @param string $fragment
+     *
+     * @return string
+     *
+     * @link https://tools.ietf.org/html/rfc3986#section-5.3
+     */
+    public static function composeComponents($scheme, $authority, $path, $query, $fragment)
+    {
+        $uri = '';
+
+        // weak type checks to also accept null until we can add scalar type hints
+        if ($scheme != '') {
+            $uri .= $scheme . ':';
+        }
+
+        if ($authority != ''|| $scheme === 'file') {
+            $uri .= '//' . $authority;
+        }
+
+        $uri .= $path;
+
+        if ($query != '') {
+            $uri .= '?' . $query;
+        }
+
+        if ($fragment != '') {
+            $uri .= '#' . $fragment;
+        }
+
+        return $uri;
+    }
+
+    /**
+     * Whether the URI has the default port of the current scheme.
+     *
+     * `Psr\Http\Message\UriInterface::getPort` may return null or the standard port. This method can be used
+     * independently of the implementation.
+     *
+     * @param UriInterface $uri
+     *
+     * @return bool
+     */
+    public static function isDefaultPort(UriInterface $uri)
+    {
+        return $uri->getPort() === null
+            || (isset(self::$defaultPorts[$uri->getScheme()]) && $uri->getPort() === self::$defaultPorts[$uri->getScheme()]);
+    }
+
+    /**
+     * Whether the URI is absolute, i.e. it has a scheme.
+     *
+     * An instance of UriInterface can either be an absolute URI or a relative reference. This method returns true
+     * if it is the former. An absolute URI has a scheme. A relative reference is used to express a URI relative
+     * to another URI, the base URI. Relative references can be divided into several forms:
+     * - network-path references, e.g. '//example.com/path'
+     * - absolute-path references, e.g. '/path'
+     * - relative-path references, e.g. 'subpath'
+     *
+     * @param UriInterface $uri
+     *
+     * @return bool
+     * @see Uri::isNetworkPathReference
+     * @see Uri::isAbsolutePathReference
+     * @see Uri::isRelativePathReference
+     * @link https://tools.ietf.org/html/rfc3986#section-4
+     */
+    public static function isAbsolute(UriInterface $uri)
+    {
+        return $uri->getScheme() !== '';
+    }
+
+    /**
+     * Whether the URI is a network-path reference.
+     *
+     * A relative reference that begins with two slash characters is termed an network-path reference.
+     *
+     * @param UriInterface $uri
+     *
+     * @return bool
+     * @link https://tools.ietf.org/html/rfc3986#section-4.2
+     */
+    public static function isNetworkPathReference(UriInterface $uri)
+    {
+        return $uri->getScheme() === '' && $uri->getAuthority() !== '';
+    }
+
+    /**
+     * Whether the URI is a absolute-path reference.
+     *
+     * A relative reference that begins with a single slash character is termed an absolute-path reference.
+     *
+     * @param UriInterface $uri
+     *
+     * @return bool
+     * @link https://tools.ietf.org/html/rfc3986#section-4.2
+     */
+    public static function isAbsolutePathReference(UriInterface $uri)
+    {
+        return $uri->getScheme() === ''
+            && $uri->getAuthority() === ''
+            && isset($uri->getPath()[0])
+            && $uri->getPath()[0] === '/';
+    }
+
+    /**
+     * Whether the URI is a relative-path reference.
+     *
+     * A relative reference that does not begin with a slash character is termed a relative-path reference.
+     *
+     * @param UriInterface $uri
+     *
+     * @return bool
+     * @link https://tools.ietf.org/html/rfc3986#section-4.2
+     */
+    public static function isRelativePathReference(UriInterface $uri)
+    {
+        return $uri->getScheme() === ''
+            && $uri->getAuthority() === ''
+            && (!isset($uri->getPath()[0]) || $uri->getPath()[0] !== '/');
+    }
+
+    /**
+     * Whether the URI is a same-document reference.
+     *
+     * A same-document reference refers to a URI that is, aside from its fragment
+     * component, identical to the base URI. When no base URI is given, only an empty
+     * URI reference (apart from its fragment) is considered a same-document reference.
+     *
+     * @param UriInterface      $uri  The URI to check
+     * @param UriInterface|null $base An optional base URI to compare against
+     *
+     * @return bool
+     * @link https://tools.ietf.org/html/rfc3986#section-4.4
+     */
+    public static function isSameDocumentReference(UriInterface $uri, UriInterface $base = null)
+    {
+        if ($base !== null) {
+            $uri = UriResolver::resolve($base, $uri);
+
+            return ($uri->getScheme() === $base->getScheme())
+                && ($uri->getAuthority() === $base->getAuthority())
+                && ($uri->getPath() === $base->getPath())
+                && ($uri->getQuery() === $base->getQuery());
+        }
+
+        return $uri->getScheme() === '' && $uri->getAuthority() === '' && $uri->getPath() === '' && $uri->getQuery() === '';
+    }
+
+    /**
+     * Removes dot segments from a path and returns the new path.
+     *
+     * @param string $path
+     *
+     * @return string
+     *
+     * @deprecated since version 1.4. Use UriResolver::removeDotSegments instead.
+     * @see UriResolver::removeDotSegments
+     */
+    public static function removeDotSegments($path)
+    {
+        return UriResolver::removeDotSegments($path);
+    }
+
+    /**
+     * Converts the relative URI into a new URI that is resolved against the base URI.
+     *
+     * @param UriInterface        $base Base URI
+     * @param string|UriInterface $rel  Relative URI
+     *
+     * @return UriInterface
+     *
+     * @deprecated since version 1.4. Use UriResolver::resolve instead.
+     * @see UriResolver::resolve
+     */
+    public static function resolve(UriInterface $base, $rel)
+    {
+        if (!($rel instanceof UriInterface)) {
+            $rel = new self($rel);
+        }
+
+        return UriResolver::resolve($base, $rel);
+    }
+
+    /**
+     * Creates a new URI with a specific query string value removed.
+     *
+     * Any existing query string values that exactly match the provided key are
+     * removed.
+     *
+     * @param UriInterface $uri URI to use as a base.
+     * @param string       $key Query string key to remove.
+     *
+     * @return UriInterface
+     */
+    public static function withoutQueryValue(UriInterface $uri, $key)
+    {
+        $current = $uri->getQuery();
+        if ($current === '') {
+            return $uri;
+        }
+
+        $decodedKey = rawurldecode($key);
+        $result = array_filter(explode('&', $current), function ($part) use ($decodedKey) {
+            return rawurldecode(explode('=', $part)[0]) !== $decodedKey;
+        });
+
+        return $uri->withQuery(implode('&', $result));
+    }
+
+    /**
+     * Creates a new URI with a specific query string value.
+     *
+     * Any existing query string values that exactly match the provided key are
+     * removed and replaced with the given key value pair.
+     *
+     * A value of null will set the query string key without a value, e.g. "key"
+     * instead of "key=value".
+     *
+     * @param UriInterface $uri   URI to use as a base.
+     * @param string       $key   Key to set.
+     * @param string|null  $value Value to set
+     *
+     * @return UriInterface
+     */
+    public static function withQueryValue(UriInterface $uri, $key, $value)
+    {
+        $current = $uri->getQuery();
+
+        if ($current === '') {
+            $result = [];
+        } else {
+            $decodedKey = rawurldecode($key);
+            $result = array_filter(explode('&', $current), function ($part) use ($decodedKey) {
+                return rawurldecode(explode('=', $part)[0]) !== $decodedKey;
+            });
+        }
+
+        // Query string separators ("=", "&") within the key or value need to be encoded
+        // (while preventing double-encoding) before setting the query string. All other
+        // chars that need percent-encoding will be encoded by withQuery().
+        $key = strtr($key, self::$replaceQuery);
+
+        if ($value !== null) {
+            $result[] = $key . '=' . strtr($value, self::$replaceQuery);
+        } else {
+            $result[] = $key;
+        }
+
+        return $uri->withQuery(implode('&', $result));
+    }
+
+    /**
+     * Creates a URI from a hash of `parse_url` components.
+     *
+     * @param array $parts
+     *
+     * @return UriInterface
+     * @link http://php.net/manual/en/function.parse-url.php
+     *
+     * @throws \InvalidArgumentException If the components do not form a valid URI.
+     */
+    public static function fromParts(array $parts)
+    {
+        $uri = new self();
+        $uri->applyParts($parts);
+        $uri->validateState();
+
+        return $uri;
+    }
+
+    public function getScheme()
+    {
+        return $this->scheme;
+    }
+
+    public function getAuthority()
+    {
+        $authority = $this->host;
+        if ($this->userInfo !== '') {
+            $authority = $this->userInfo . '@' . $authority;
+        }
+
+        if ($this->port !== null) {
+            $authority .= ':' . $this->port;
+        }
+
+        return $authority;
+    }
+
+    public function getUserInfo()
+    {
+        return $this->userInfo;
+    }
+
+    public function getHost()
+    {
+        return $this->host;
+    }
+
+    public function getPort()
+    {
+        return $this->port;
+    }
+
+    public function getPath()
+    {
+        return $this->path;
+    }
+
+    public function getQuery()
+    {
+        return $this->query;
+    }
+
+    public function getFragment()
+    {
+        return $this->fragment;
+    }
+
+    public function withScheme($scheme)
+    {
+        $scheme = $this->filterScheme($scheme);
+
+        if ($this->scheme === $scheme) {
+            return $this;
+        }
+
+        $new = clone $this;
+        $new->scheme = $scheme;
+        $new->removeDefaultPort();
+        $new->validateState();
+
+        return $new;
+    }
+
+    public function withUserInfo($user, $password = null)
+    {
+        $info = $user;
+        if ($password != '') {
+            $info .= ':' . $password;
+        }
+
+        if ($this->userInfo === $info) {
+            return $this;
+        }
+
+        $new = clone $this;
+        $new->userInfo = $info;
+        $new->validateState();
+
+        return $new;
+    }
+
+    public function withHost($host)
+    {
+        $host = $this->filterHost($host);
+
+        if ($this->host === $host) {
+            return $this;
+        }
+
+        $new = clone $this;
+        $new->host = $host;
+        $new->validateState();
+
+        return $new;
+    }
+
+    public function withPort($port)
+    {
+        $port = $this->filterPort($port);
+
+        if ($this->port === $port) {
+            return $this;
+        }
+
+        $new = clone $this;
+        $new->port = $port;
+        $new->removeDefaultPort();
+        $new->validateState();
+
+        return $new;
+    }
+
+    public function withPath($path)
+    {
+        $path = $this->filterPath($path);
+
+        if ($this->path === $path) {
+            return $this;
+        }
+
+        $new = clone $this;
+        $new->path = $path;
+        $new->validateState();
+
+        return $new;
+    }
+
+    public function withQuery($query)
+    {
+        $query = $this->filterQueryAndFragment($query);
+
+        if ($this->query === $query) {
+            return $this;
+        }
+
+        $new = clone $this;
+        $new->query = $query;
+
+        return $new;
+    }
+
+    public function withFragment($fragment)
+    {
+        $fragment = $this->filterQueryAndFragment($fragment);
+
+        if ($this->fragment === $fragment) {
+            return $this;
+        }
+
+        $new = clone $this;
+        $new->fragment = $fragment;
+
+        return $new;
+    }
+
+    /**
+     * Apply parse_url parts to a URI.
+     *
+     * @param array $parts Array of parse_url parts to apply.
+     */
+    private function applyParts(array $parts)
+    {
+        $this->scheme = isset($parts['scheme'])
+            ? $this->filterScheme($parts['scheme'])
+            : '';
+        $this->userInfo = isset($parts['user']) ? $parts['user'] : '';
+        $this->host = isset($parts['host'])
+            ? $this->filterHost($parts['host'])
+            : '';
+        $this->port = isset($parts['port'])
+            ? $this->filterPort($parts['port'])
+            : null;
+        $this->path = isset($parts['path'])
+            ? $this->filterPath($parts['path'])
+            : '';
+        $this->query = isset($parts['query'])
+            ? $this->filterQueryAndFragment($parts['query'])
+            : '';
+        $this->fragment = isset($parts['fragment'])
+            ? $this->filterQueryAndFragment($parts['fragment'])
+            : '';
+        if (isset($parts['pass'])) {
+            $this->userInfo .= ':' . $parts['pass'];
+        }
+
+        $this->removeDefaultPort();
+    }
+
+    /**
+     * @param string $scheme
+     *
+     * @return string
+     *
+     * @throws \InvalidArgumentException If the scheme is invalid.
+     */
+    private function filterScheme($scheme)
+    {
+        if (!is_string($scheme)) {
+            throw new \InvalidArgumentException('Scheme must be a string');
+        }
+
+        return strtolower($scheme);
+    }
+
+    /**
+     * @param string $host
+     *
+     * @return string
+     *
+     * @throws \InvalidArgumentException If the host is invalid.
+     */
+    private function filterHost($host)
+    {
+        if (!is_string($host)) {
+            throw new \InvalidArgumentException('Host must be a string');
+        }
+
+        return strtolower($host);
+    }
+
+    /**
+     * @param int|null $port
+     *
+     * @return int|null
+     *
+     * @throws \InvalidArgumentException If the port is invalid.
+     */
+    private function filterPort($port)
+    {
+        if ($port === null) {
+            return null;
+        }
+
+        $port = (int) $port;
+        if (1 > $port || 0xffff < $port) {
+            throw new \InvalidArgumentException(
+                sprintf('Invalid port: %d. Must be between 1 and 65535', $port)
+            );
+        }
+
+        return $port;
+    }
+
+    private function removeDefaultPort()
+    {
+        if ($this->port !== null && self::isDefaultPort($this)) {
+            $this->port = null;
+        }
+    }
+
+    /**
+     * Filters the path of a URI
+     *
+     * @param string $path
+     *
+     * @return string
+     *
+     * @throws \InvalidArgumentException If the path is invalid.
+     */
+    private function filterPath($path)
+    {
+        if (!is_string($path)) {
+            throw new \InvalidArgumentException('Path must be a string');
+        }
+
+        return preg_replace_callback(
+            '/(?:[^' . self::$charUnreserved . self::$charSubDelims . '%:@\/]++|%(?![A-Fa-f0-9]{2}))/',
+            [$this, 'rawurlencodeMatchZero'],
+            $path
+        );
+    }
+
+    /**
+     * Filters the query string or fragment of a URI.
+     *
+     * @param string $str
+     *
+     * @return string
+     *
+     * @throws \InvalidArgumentException If the query or fragment is invalid.
+     */
+    private function filterQueryAndFragment($str)
+    {
+        if (!is_string($str)) {
+            throw new \InvalidArgumentException('Query and fragment must be a string');
+        }
+
+        return preg_replace_callback(
+            '/(?:[^' . self::$charUnreserved . self::$charSubDelims . '%:@\/\?]++|%(?![A-Fa-f0-9]{2}))/',
+            [$this, 'rawurlencodeMatchZero'],
+            $str
+        );
+    }
+
+    private function rawurlencodeMatchZero(array $match)
+    {
+        return rawurlencode($match[0]);
+    }
+
+    private function validateState()
+    {
+        if ($this->host === '' && ($this->scheme === 'http' || $this->scheme === 'https')) {
+            $this->host = self::HTTP_DEFAULT_HOST;
+        }
+
+        if ($this->getAuthority() === '') {
+            if (0 === strpos($this->path, '//')) {
+                throw new \InvalidArgumentException('The path of a URI without an authority must not start with two slashes "//"');
+            }
+            if ($this->scheme === '' && false !== strpos(explode('/', $this->path, 2)[0], ':')) {
+                throw new \InvalidArgumentException('A relative URI must not have a path beginning with a segment containing a colon');
+            }
+        } elseif (isset($this->path[0]) && $this->path[0] !== '/') {
+            @trigger_error(
+                'The path of a URI with an authority must start with a slash "/" or be empty. Automagically fixing the URI ' .
+                'by adding a leading slash to the path is deprecated since version 1.4 and will throw an exception instead.',
+                E_USER_DEPRECATED
+            );
+            $this->path = '/'. $this->path;
+            //throw new \InvalidArgumentException('The path of a URI with an authority must start with a slash "/" or be empty');
+        }
+    }
+}
diff --git a/Postman/Postman-Mail/mailgun/vendor/guzzlehttp/psr7/src/UriNormalizer.php b/Postman/Postman-Mail/mailgun/vendor/guzzlehttp/psr7/src/UriNormalizer.php
new file mode 100644
index 0000000..384c29e
--- /dev/null
+++ b/Postman/Postman-Mail/mailgun/vendor/guzzlehttp/psr7/src/UriNormalizer.php
@@ -0,0 +1,216 @@
+<?php
+namespace GuzzleHttp\Psr7;
+
+use Psr\Http\Message\UriInterface;
+
+/**
+ * Provides methods to normalize and compare URIs.
+ *
+ * @author Tobias Schultze
+ *
+ * @link https://tools.ietf.org/html/rfc3986#section-6
+ */
+final class UriNormalizer
+{
+    /**
+     * Default normalizations which only include the ones that preserve semantics.
+     *
+     * self::CAPITALIZE_PERCENT_ENCODING | self::DECODE_UNRESERVED_CHARACTERS | self::CONVERT_EMPTY_PATH |
+     * self::REMOVE_DEFAULT_HOST | self::REMOVE_DEFAULT_PORT | self::REMOVE_DOT_SEGMENTS
+     */
+    const PRESERVING_NORMALIZATIONS = 63;
+
+    /**
+     * All letters within a percent-encoding triplet (e.g., "%3A") are case-insensitive, and should be capitalized.
+     *
+     * Example: http://example.org/a%c2%b1b → http://example.org/a%C2%B1b
+     */
+    const CAPITALIZE_PERCENT_ENCODING = 1;
+
+    /**
+     * Decodes percent-encoded octets of unreserved characters.
+     *
+     * For consistency, percent-encoded octets in the ranges of ALPHA (%41–%5A and %61–%7A), DIGIT (%30–%39),
+     * hyphen (%2D), period (%2E), underscore (%5F), or tilde (%7E) should not be created by URI producers and,
+     * when found in a URI, should be decoded to their corresponding unreserved characters by URI normalizers.
+     *
+     * Example: http://example.org/%7Eusern%61me/ → http://example.org/~username/
+     */
+    const DECODE_UNRESERVED_CHARACTERS = 2;
+
+    /**
+     * Converts the empty path to "/" for http and https URIs.
+     *
+     * Example: http://example.org → http://example.org/
+     */
+    const CONVERT_EMPTY_PATH = 4;
+
+    /**
+     * Removes the default host of the given URI scheme from the URI.
+     *
+     * Only the "file" scheme defines the default host "localhost".
+     * All of `file:/myfile`, `file:///myfile`, and `file://localhost/myfile`
+     * are equivalent according to RFC 3986. The first format is not accepted
+     * by PHPs stream functions and thus already normalized implicitly to the
+     * second format in the Uri class. See `GuzzleHttp\Psr7\Uri::composeComponents`.
+     *
+     * Example: file://localhost/myfile → file:///myfile
+     */
+    const REMOVE_DEFAULT_HOST = 8;
+
+    /**
+     * Removes the default port of the given URI scheme from the URI.
+     *
+     * Example: http://example.org:80/ → http://example.org/
+     */
+    const REMOVE_DEFAULT_PORT = 16;
+
+    /**
+     * Removes unnecessary dot-segments.
+     *
+     * Dot-segments in relative-path references are not removed as it would
+     * change the semantics of the URI reference.
+     *
+     * Example: http://example.org/../a/b/../c/./d.html → http://example.org/a/c/d.html
+     */
+    const REMOVE_DOT_SEGMENTS = 32;
+
+    /**
+     * Paths which include two or more adjacent slashes are converted to one.
+     *
+     * Webservers usually ignore duplicate slashes and treat those URIs equivalent.
+     * But in theory those URIs do not need to be equivalent. So this normalization
+     * may change the semantics. Encoded slashes (%2F) are not removed.
+     *
+     * Example: http://example.org//foo///bar.html → http://example.org/foo/bar.html
+     */
+    const REMOVE_DUPLICATE_SLASHES = 64;
+
+    /**
+     * Sort query parameters with their values in alphabetical order.
+     *
+     * However, the order of parameters in a URI may be significant (this is not defined by the standard).
+     * So this normalization is not safe and may change the semantics of the URI.
+     *
+     * Example: ?lang=en&article=fred → ?article=fred&lang=en
+     *
+     * Note: The sorting is neither locale nor Unicode aware (the URI query does not get decoded at all) as the
+     * purpose is to be able to compare URIs in a reproducible way, not to have the params sorted perfectly.
+     */
+    const SORT_QUERY_PARAMETERS = 128;
+
+    /**
+     * Returns a normalized URI.
+     *
+     * The scheme and host component are already normalized to lowercase per PSR-7 UriInterface.
+     * This methods adds additional normalizations that can be configured with the $flags parameter.
+     *
+     * PSR-7 UriInterface cannot distinguish between an empty component and a missing component as
+     * getQuery(), getFragment() etc. always return a string. This means the URIs "/?#" and "/" are
+     * treated equivalent which is not necessarily true according to RFC 3986. But that difference
+     * is highly uncommon in reality. So this potential normalization is implied in PSR-7 as well.
+     *
+     * @param UriInterface $uri   The URI to normalize
+     * @param int          $flags A bitmask of normalizations to apply, see constants
+     *
+     * @return UriInterface The normalized URI
+     * @link https://tools.ietf.org/html/rfc3986#section-6.2
+     */
+    public static function normalize(UriInterface $uri, $flags = self::PRESERVING_NORMALIZATIONS)
+    {
+        if ($flags & self::CAPITALIZE_PERCENT_ENCODING) {
+            $uri = self::capitalizePercentEncoding($uri);
+        }
+
+        if ($flags & self::DECODE_UNRESERVED_CHARACTERS) {
+            $uri = self::decodeUnreservedCharacters($uri);
+        }
+
+        if ($flags & self::CONVERT_EMPTY_PATH && $uri->getPath() === '' &&
+            ($uri->getScheme() === 'http' || $uri->getScheme() === 'https')
+        ) {
+            $uri = $uri->withPath('/');
+        }
+
+        if ($flags & self::REMOVE_DEFAULT_HOST && $uri->getScheme() === 'file' && $uri->getHost() === 'localhost') {
+            $uri = $uri->withHost('');
+        }
+
+        if ($flags & self::REMOVE_DEFAULT_PORT && $uri->getPort() !== null && Uri::isDefaultPort($uri)) {
+            $uri = $uri->withPort(null);
+        }
+
+        if ($flags & self::REMOVE_DOT_SEGMENTS && !Uri::isRelativePathReference($uri)) {
+            $uri = $uri->withPath(UriResolver::removeDotSegments($uri->getPath()));
+        }
+
+        if ($flags & self::REMOVE_DUPLICATE_SLASHES) {
+            $uri = $uri->withPath(preg_replace('#//++#', '/', $uri->getPath()));
+        }
+
+        if ($flags & self::SORT_QUERY_PARAMETERS && $uri->getQuery() !== '') {
+            $queryKeyValues = explode('&', $uri->getQuery());
+            sort($queryKeyValues);
+            $uri = $uri->withQuery(implode('&', $queryKeyValues));
+        }
+
+        return $uri;
+    }
+
+    /**
+     * Whether two URIs can be considered equivalent.
+     *
+     * Both URIs are normalized automatically before comparison with the given $normalizations bitmask. The method also
+     * accepts relative URI references and returns true when they are equivalent. This of course assumes they will be
+     * resolved against the same base URI. If this is not the case, determination of equivalence or difference of
+     * relative references does not mean anything.
+     *
+     * @param UriInterface $uri1           An URI to compare
+     * @param UriInterface $uri2           An URI to compare
+     * @param int          $normalizations A bitmask of normalizations to apply, see constants
+     *
+     * @return bool
+     * @link https://tools.ietf.org/html/rfc3986#section-6.1
+     */
+    public static function isEquivalent(UriInterface $uri1, UriInterface $uri2, $normalizations = self::PRESERVING_NORMALIZATIONS)
+    {
+        return (string) self::normalize($uri1, $normalizations) === (string) self::normalize($uri2, $normalizations);
+    }
+
+    private static function capitalizePercentEncoding(UriInterface $uri)
+    {
+        $regex = '/(?:%[A-Fa-f0-9]{2})++/';
+
+        $callback = function (array $match) {
+            return strtoupper($match[0]);
+        };
+
+        return
+            $uri->withPath(
+                preg_replace_callback($regex, $callback, $uri->getPath())
+            )->withQuery(
+                preg_replace_callback($regex, $callback, $uri->getQuery())
+            );
+    }
+
+    private static function decodeUnreservedCharacters(UriInterface $uri)
+    {
+        $regex = '/%(?:2D|2E|5F|7E|3[0-9]|[46][1-9A-F]|[57][0-9A])/i';
+
+        $callback = function (array $match) {
+            return rawurldecode($match[0]);
+        };
+
+        return
+            $uri->withPath(
+                preg_replace_callback($regex, $callback, $uri->getPath())
+            )->withQuery(
+                preg_replace_callback($regex, $callback, $uri->getQuery())
+            );
+    }
+
+    private function __construct()
+    {
+        // cannot be instantiated
+    }
+}
diff --git a/Postman/Postman-Mail/mailgun/vendor/guzzlehttp/psr7/src/UriResolver.php b/Postman/Postman-Mail/mailgun/vendor/guzzlehttp/psr7/src/UriResolver.php
new file mode 100644
index 0000000..c1cb8a2
--- /dev/null
+++ b/Postman/Postman-Mail/mailgun/vendor/guzzlehttp/psr7/src/UriResolver.php
@@ -0,0 +1,219 @@
+<?php
+namespace GuzzleHttp\Psr7;
+
+use Psr\Http\Message\UriInterface;
+
+/**
+ * Resolves a URI reference in the context of a base URI and the opposite way.
+ *
+ * @author Tobias Schultze
+ *
+ * @link https://tools.ietf.org/html/rfc3986#section-5
+ */
+final class UriResolver
+{
+    /**
+     * Removes dot segments from a path and returns the new path.
+     *
+     * @param string $path
+     *
+     * @return string
+     * @link http://tools.ietf.org/html/rfc3986#section-5.2.4
+     */
+    public static function removeDotSegments($path)
+    {
+        if ($path === '' || $path === '/') {
+            return $path;
+        }
+
+        $results = [];
+        $segments = explode('/', $path);
+        foreach ($segments as $segment) {
+            if ($segment === '..') {
+                array_pop($results);
+            } elseif ($segment !== '.') {
+                $results[] = $segment;
+            }
+        }
+
+        $newPath = implode('/', $results);
+
+        if ($path[0] === '/' && (!isset($newPath[0]) || $newPath[0] !== '/')) {
+            // Re-add the leading slash if necessary for cases like "/.."
+            $newPath = '/' . $newPath;
+        } elseif ($newPath !== '' && ($segment === '.' || $segment === '..')) {
+            // Add the trailing slash if necessary
+            // If newPath is not empty, then $segment must be set and is the last segment from the foreach
+            $newPath .= '/';
+        }
+
+        return $newPath;
+    }
+
+    /**
+     * Converts the relative URI into a new URI that is resolved against the base URI.
+     *
+     * @param UriInterface $base Base URI
+     * @param UriInterface $rel  Relative URI
+     *
+     * @return UriInterface
+     * @link http://tools.ietf.org/html/rfc3986#section-5.2
+     */
+    public static function resolve(UriInterface $base, UriInterface $rel)
+    {
+        if ((string) $rel === '') {
+            // we can simply return the same base URI instance for this same-document reference
+            return $base;
+        }
+
+        if ($rel->getScheme() != '') {
+            return $rel->withPath(self::removeDotSegments($rel->getPath()));
+        }
+
+        if ($rel->getAuthority() != '') {
+            $targetAuthority = $rel->getAuthority();
+            $targetPath = self::removeDotSegments($rel->getPath());
+            $targetQuery = $rel->getQuery();
+        } else {
+            $targetAuthority = $base->getAuthority();
+            if ($rel->getPath() === '') {
+                $targetPath = $base->getPath();
+                $targetQuery = $rel->getQuery() != '' ? $rel->getQuery() : $base->getQuery();
+            } else {
+                if ($rel->getPath()[0] === '/') {
+                    $targetPath = $rel->getPath();
+                } else {
+                    if ($targetAuthority != '' && $base->getPath() === '') {
+                        $targetPath = '/' . $rel->getPath();
+                    } else {
+                        $lastSlashPos = strrpos($base->getPath(), '/');
+                        if ($lastSlashPos === false) {
+                            $targetPath = $rel->getPath();
+                        } else {
+                            $targetPath = substr($base->getPath(), 0, $lastSlashPos + 1) . $rel->getPath();
+                        }
+                    }
+                }
+                $targetPath = self::removeDotSegments($targetPath);
+                $targetQuery = $rel->getQuery();
+            }
+        }
+
+        return new Uri(Uri::composeComponents(
+            $base->getScheme(),
+            $targetAuthority,
+            $targetPath,
+            $targetQuery,
+            $rel->getFragment()
+        ));
+    }
+
+    /**
+     * Returns the target URI as a relative reference from the base URI.
+     *
+     * This method is the counterpart to resolve():
+     *
+     *    (string) $target === (string) UriResolver::resolve($base, UriResolver::relativize($base, $target))
+     *
+     * One use-case is to use the current request URI as base URI and then generate relative links in your documents
+     * to reduce the document size or offer self-contained downloadable document archives.
+     *
+     *    $base = new Uri('http://example.com/a/b/');
+     *    echo UriResolver::relativize($base, new Uri('http://example.com/a/b/c'));  // prints 'c'.
+     *    echo UriResolver::relativize($base, new Uri('http://example.com/a/x/y'));  // prints '../x/y'.
+     *    echo UriResolver::relativize($base, new Uri('http://example.com/a/b/?q')); // prints '?q'.
+     *    echo UriResolver::relativize($base, new Uri('http://example.org/a/b/'));   // prints '//example.org/a/b/'.
+     *
+     * This method also accepts a target that is already relative and will try to relativize it further. Only a
+     * relative-path reference will be returned as-is.
+     *
+     *    echo UriResolver::relativize($base, new Uri('/a/b/c'));  // prints 'c' as well
+     *
+     * @param UriInterface $base   Base URI
+     * @param UriInterface $target Target URI
+     *
+     * @return UriInterface The relative URI reference
+     */
+    public static function relativize(UriInterface $base, UriInterface $target)
+    {
+        if ($target->getScheme() !== '' &&
+            ($base->getScheme() !== $target->getScheme() || $target->getAuthority() === '' && $base->getAuthority() !== '')
+        ) {
+            return $target;
+        }
+
+        if (Uri::isRelativePathReference($target)) {
+            // As the target is already highly relative we return it as-is. It would be possible to resolve
+            // the target with `$target = self::resolve($base, $target);` and then try make it more relative
+            // by removing a duplicate query. But let's not do that automatically.
+            return $target;
+        }
+
+        if ($target->getAuthority() !== '' && $base->getAuthority() !== $target->getAuthority()) {
+            return $target->withScheme('');
+        }
+
+        // We must remove the path before removing the authority because if the path starts with two slashes, the URI
+        // would turn invalid. And we also cannot set a relative path before removing the authority, as that is also
+        // invalid.
+        $emptyPathUri = $target->withScheme('')->withPath('')->withUserInfo('')->withPort(null)->withHost('');
+
+        if ($base->getPath() !== $target->getPath()) {
+            return $emptyPathUri->withPath(self::getRelativePath($base, $target));
+        }
+
+        if ($base->getQuery() === $target->getQuery()) {
+            // Only the target fragment is left. And it must be returned even if base and target fragment are the same.
+            return $emptyPathUri->withQuery('');
+        }
+
+        // If the base URI has a query but the target has none, we cannot return an empty path reference as it would
+        // inherit the base query component when resolving.
+        if ($target->getQuery() === '') {
+            $segments = explode('/', $target->getPath());
+            $lastSegment = end($segments);
+
+            return $emptyPathUri->withPath($lastSegment === '' ? './' : $lastSegment);
+        }
+
+        return $emptyPathUri;
+    }
+
+    private static function getRelativePath(UriInterface $base, UriInterface $target)
+    {
+        $sourceSegments = explode('/', $base->getPath());
+        $targetSegments = explode('/', $target->getPath());
+        array_pop($sourceSegments);
+        $targetLastSegment = array_pop($targetSegments);
+        foreach ($sourceSegments as $i => $segment) {
+            if (isset($targetSegments[$i]) && $segment === $targetSegments[$i]) {
+                unset($sourceSegments[$i], $targetSegments[$i]);
+            } else {
+                break;
+            }
+        }
+        $targetSegments[] = $targetLastSegment;
+        $relativePath = str_repeat('../', count($sourceSegments)) . implode('/', $targetSegments);
+
+        // A reference to am empty last segment or an empty first sub-segment must be prefixed with "./".
+        // This also applies to a segment with a colon character (e.g., "file:colon") that cannot be used
+        // as the first segment of a relative-path reference, as it would be mistaken for a scheme name.
+        if ('' === $relativePath || false !== strpos(explode('/', $relativePath, 2)[0], ':')) {
+            $relativePath = "./$relativePath";
+        } elseif ('/' === $relativePath[0]) {
+            if ($base->getAuthority() != '' && $base->getPath() === '') {
+                // In this case an extra slash is added by resolve() automatically. So we must not add one here.
+                $relativePath = ".$relativePath";
+            } else {
+                $relativePath = "./$relativePath";
+            }
+        }
+
+        return $relativePath;
+    }
+
+    private function __construct()
+    {
+        // cannot be instantiated
+    }
+}
diff --git a/Postman/Postman-Mail/mailgun/vendor/guzzlehttp/psr7/src/functions.php b/Postman/Postman-Mail/mailgun/vendor/guzzlehttp/psr7/src/functions.php
new file mode 100644
index 0000000..e40348d
--- /dev/null
+++ b/Postman/Postman-Mail/mailgun/vendor/guzzlehttp/psr7/src/functions.php
@@ -0,0 +1,828 @@
+<?php
+namespace GuzzleHttp\Psr7;
+
+use Psr\Http\Message\MessageInterface;
+use Psr\Http\Message\RequestInterface;
+use Psr\Http\Message\ResponseInterface;
+use Psr\Http\Message\ServerRequestInterface;
+use Psr\Http\Message\StreamInterface;
+use Psr\Http\Message\UriInterface;
+
+/**
+ * Returns the string representation of an HTTP message.
+ *
+ * @param MessageInterface $message Message to convert to a string.
+ *
+ * @return string
+ */
+function str(MessageInterface $message)
+{
+    if ($message instanceof RequestInterface) {
+        $msg = trim($message->getMethod() . ' '
+                . $message->getRequestTarget())
+            . ' HTTP/' . $message->getProtocolVersion();
+        if (!$message->hasHeader('host')) {
+            $msg .= "\r\nHost: " . $message->getUri()->getHost();
+        }
+    } elseif ($message instanceof ResponseInterface) {
+        $msg = 'HTTP/' . $message->getProtocolVersion() . ' '
+            . $message->getStatusCode() . ' '
+            . $message->getReasonPhrase();
+    } else {
+        throw new \InvalidArgumentException('Unknown message type');
+    }
+
+    foreach ($message->getHeaders() as $name => $values) {
+        $msg .= "\r\n{$name}: " . implode(', ', $values);
+    }
+
+    return "{$msg}\r\n\r\n" . $message->getBody();
+}
+
+/**
+ * Returns a UriInterface for the given value.
+ *
+ * This function accepts a string or {@see Psr\Http\Message\UriInterface} and
+ * returns a UriInterface for the given value. If the value is already a
+ * `UriInterface`, it is returned as-is.
+ *
+ * @param string|UriInterface $uri
+ *
+ * @return UriInterface
+ * @throws \InvalidArgumentException
+ */
+function uri_for($uri)
+{
+    if ($uri instanceof UriInterface) {
+        return $uri;
+    } elseif (is_string($uri)) {
+        return new Uri($uri);
+    }
+
+    throw new \InvalidArgumentException('URI must be a string or UriInterface');
+}
+
+/**
+ * Create a new stream based on the input type.
+ *
+ * Options is an associative array that can contain the following keys:
+ * - metadata: Array of custom metadata.
+ * - size: Size of the stream.
+ *
+ * @param resource|string|null|int|float|bool|StreamInterface|callable $resource Entity body data
+ * @param array                                                        $options  Additional options
+ *
+ * @return Stream
+ * @throws \InvalidArgumentException if the $resource arg is not valid.
+ */
+function stream_for($resource = '', array $options = [])
+{
+    if (is_scalar($resource)) {
+        $stream = fopen('php://temp', 'r+');
+        if ($resource !== '') {
+            fwrite($stream, $resource);
+            fseek($stream, 0);
+        }
+        return new Stream($stream, $options);
+    }
+
+    switch (gettype($resource)) {
+        case 'resource':
+            return new Stream($resource, $options);
+        case 'object':
+            if ($resource instanceof StreamInterface) {
+                return $resource;
+            } elseif ($resource instanceof \Iterator) {
+                return new PumpStream(function () use ($resource) {
+                    if (!$resource->valid()) {
+                        return false;
+                    }
+                    $result = $resource->current();
+                    $resource->next();
+                    return $result;
+                }, $options);
+            } elseif (method_exists($resource, '__toString')) {
+                return stream_for((string) $resource, $options);
+            }
+            break;
+        case 'NULL':
+            return new Stream(fopen('php://temp', 'r+'), $options);
+    }
+
+    if (is_callable($resource)) {
+        return new PumpStream($resource, $options);
+    }
+
+    throw new \InvalidArgumentException('Invalid resource type: ' . gettype($resource));
+}
+
+/**
+ * Parse an array of header values containing ";" separated data into an
+ * array of associative arrays representing the header key value pair
+ * data of the header. When a parameter does not contain a value, but just
+ * contains a key, this function will inject a key with a '' string value.
+ *
+ * @param string|array $header Header to parse into components.
+ *
+ * @return array Returns the parsed header values.
+ */
+function parse_header($header)
+{
+    static $trimmed = "\"'  \n\t\r";
+    $params = $matches = [];
+
+    foreach (normalize_header($header) as $val) {
+        $part = [];
+        foreach (preg_split('/;(?=([^"]*"[^"]*")*[^"]*$)/', $val) as $kvp) {
+            if (preg_match_all('/<[^>]+>|[^=]+/', $kvp, $matches)) {
+                $m = $matches[0];
+                if (isset($m[1])) {
+                    $part[trim($m[0], $trimmed)] = trim($m[1], $trimmed);
+                } else {
+                    $part[] = trim($m[0], $trimmed);
+                }
+            }
+        }
+        if ($part) {
+            $params[] = $part;
+        }
+    }
+
+    return $params;
+}
+
+/**
+ * Converts an array of header values that may contain comma separated
+ * headers into an array of headers with no comma separated values.
+ *
+ * @param string|array $header Header to normalize.
+ *
+ * @return array Returns the normalized header field values.
+ */
+function normalize_header($header)
+{
+    if (!is_array($header)) {
+        return array_map('trim', explode(',', $header));
+    }
+
+    $result = [];
+    foreach ($header as $value) {
+        foreach ((array) $value as $v) {
+            if (strpos($v, ',') === false) {
+                $result[] = $v;
+                continue;
+            }
+            foreach (preg_split('/,(?=([^"]*"[^"]*")*[^"]*$)/', $v) as $vv) {
+                $result[] = trim($vv);
+            }
+        }
+    }
+
+    return $result;
+}
+
+/**
+ * Clone and modify a request with the given changes.
+ *
+ * The changes can be one of:
+ * - method: (string) Changes the HTTP method.
+ * - set_headers: (array) Sets the given headers.
+ * - remove_headers: (array) Remove the given headers.
+ * - body: (mixed) Sets the given body.
+ * - uri: (UriInterface) Set the URI.
+ * - query: (string) Set the query string value of the URI.
+ * - version: (string) Set the protocol version.
+ *
+ * @param RequestInterface $request Request to clone and modify.
+ * @param array            $changes Changes to apply.
+ *
+ * @return RequestInterface
+ */
+function modify_request(RequestInterface $request, array $changes)
+{
+    if (!$changes) {
+        return $request;
+    }
+
+    $headers = $request->getHeaders();
+
+    if (!isset($changes['uri'])) {
+        $uri = $request->getUri();
+    } else {
+        // Remove the host header if one is on the URI
+        if ($host = $changes['uri']->getHost()) {
+            $changes['set_headers']['Host'] = $host;
+
+            if ($port = $changes['uri']->getPort()) {
+                $standardPorts = ['http' => 80, 'https' => 443];
+                $scheme = $changes['uri']->getScheme();
+                if (isset($standardPorts[$scheme]) && $port != $standardPorts[$scheme]) {
+                    $changes['set_headers']['Host'] .= ':'.$port;
+                }
+            }
+        }
+        $uri = $changes['uri'];
+    }
+
+    if (!empty($changes['remove_headers'])) {
+        $headers = _caseless_remove($changes['remove_headers'], $headers);
+    }
+
+    if (!empty($changes['set_headers'])) {
+        $headers = _caseless_remove(array_keys($changes['set_headers']), $headers);
+        $headers = $changes['set_headers'] + $headers;
+    }
+
+    if (isset($changes['query'])) {
+        $uri = $uri->withQuery($changes['query']);
+    }
+
+    if ($request instanceof ServerRequestInterface) {
+        return new ServerRequest(
+            isset($changes['method']) ? $changes['method'] : $request->getMethod(),
+            $uri,
+            $headers,
+            isset($changes['body']) ? $changes['body'] : $request->getBody(),
+            isset($changes['version'])
+                ? $changes['version']
+                : $request->getProtocolVersion(),
+            $request->getServerParams()
+        );
+    }
+
+    return new Request(
+        isset($changes['method']) ? $changes['method'] : $request->getMethod(),
+        $uri,
+        $headers,
+        isset($changes['body']) ? $changes['body'] : $request->getBody(),
+        isset($changes['version'])
+            ? $changes['version']
+            : $request->getProtocolVersion()
+    );
+}
+
+/**
+ * Attempts to rewind a message body and throws an exception on failure.
+ *
+ * The body of the message will only be rewound if a call to `tell()` returns a
+ * value other than `0`.
+ *
+ * @param MessageInterface $message Message to rewind
+ *
+ * @throws \RuntimeException
+ */
+function rewind_body(MessageInterface $message)
+{
+    $body = $message->getBody();
+
+    if ($body->tell()) {
+        $body->rewind();
+    }
+}
+
+/**
+ * Safely opens a PHP stream resource using a filename.
+ *
+ * When fopen fails, PHP normally raises a warning. This function adds an
+ * error handler that checks for errors and throws an exception instead.
+ *
+ * @param string $filename File to open
+ * @param string $mode     Mode used to open the file
+ *
+ * @return resource
+ * @throws \RuntimeException if the file cannot be opened
+ */
+function try_fopen($filename, $mode)
+{
+    $ex = null;
+    set_error_handler(function () use ($filename, $mode, &$ex) {
+        $ex = new \RuntimeException(sprintf(
+            'Unable to open %s using mode %s: %s',
+            $filename,
+            $mode,
+            func_get_args()[1]
+        ));
+    });
+
+    $handle = fopen($filename, $mode);
+    restore_error_handler();
+
+    if ($ex) {
+        /** @var $ex \RuntimeException */
+        throw $ex;
+    }
+
+    return $handle;
+}
+
+/**
+ * Copy the contents of a stream into a string until the given number of
+ * bytes have been read.
+ *
+ * @param StreamInterface $stream Stream to read
+ * @param int             $maxLen Maximum number of bytes to read. Pass -1
+ *                                to read the entire stream.
+ * @return string
+ * @throws \RuntimeException on error.
+ */
+function copy_to_string(StreamInterface $stream, $maxLen = -1)
+{
+    $buffer = '';
+
+    if ($maxLen === -1) {
+        while (!$stream->eof()) {
+            $buf = $stream->read(1048576);
+            // Using a loose equality here to match on '' and false.
+            if ($buf == null) {
+                break;
+            }
+            $buffer .= $buf;
+        }
+        return $buffer;
+    }
+
+    $len = 0;
+    while (!$stream->eof() && $len < $maxLen) {
+        $buf = $stream->read($maxLen - $len);
+        // Using a loose equality here to match on '' and false.
+        if ($buf == null) {
+            break;
+        }
+        $buffer .= $buf;
+        $len = strlen($buffer);
+    }
+
+    return $buffer;
+}
+
+/**
+ * Copy the contents of a stream into another stream until the given number
+ * of bytes have been read.
+ *
+ * @param StreamInterface $source Stream to read from
+ * @param StreamInterface $dest   Stream to write to
+ * @param int             $maxLen Maximum number of bytes to read. Pass -1
+ *                                to read the entire stream.
+ *
+ * @throws \RuntimeException on error.
+ */
+function copy_to_stream(
+    StreamInterface $source,
+    StreamInterface $dest,
+    $maxLen = -1
+) {
+    $bufferSize = 8192;
+
+    if ($maxLen === -1) {
+        while (!$source->eof()) {
+            if (!$dest->write($source->read($bufferSize))) {
+                break;
+            }
+        }
+    } else {
+        $remaining = $maxLen;
+        while ($remaining > 0 && !$source->eof()) {
+            $buf = $source->read(min($bufferSize, $remaining));
+            $len = strlen($buf);
+            if (!$len) {
+                break;
+            }
+            $remaining -= $len;
+            $dest->write($buf);
+        }
+    }
+}
+
+/**
+ * Calculate a hash of a Stream
+ *
+ * @param StreamInterface $stream    Stream to calculate the hash for
+ * @param string          $algo      Hash algorithm (e.g. md5, crc32, etc)
+ * @param bool            $rawOutput Whether or not to use raw output
+ *
+ * @return string Returns the hash of the stream
+ * @throws \RuntimeException on error.
+ */
+function hash(
+    StreamInterface $stream,
+    $algo,
+    $rawOutput = false
+) {
+    $pos = $stream->tell();
+
+    if ($pos > 0) {
+        $stream->rewind();
+    }
+
+    $ctx = hash_init($algo);
+    while (!$stream->eof()) {
+        hash_update($ctx, $stream->read(1048576));
+    }
+
+    $out = hash_final($ctx, (bool) $rawOutput);
+    $stream->seek($pos);
+
+    return $out;
+}
+
+/**
+ * Read a line from the stream up to the maximum allowed buffer length
+ *
+ * @param StreamInterface $stream    Stream to read from
+ * @param int             $maxLength Maximum buffer length
+ *
+ * @return string|bool
+ */
+function readline(StreamInterface $stream, $maxLength = null)
+{
+    $buffer = '';
+    $size = 0;
+
+    while (!$stream->eof()) {
+        // Using a loose equality here to match on '' and false.
+        if (null == ($byte = $stream->read(1))) {
+            return $buffer;
+        }
+        $buffer .= $byte;
+        // Break when a new line is found or the max length - 1 is reached
+        if ($byte === "\n" || ++$size === $maxLength - 1) {
+            break;
+        }
+    }
+
+    return $buffer;
+}
+
+/**
+ * Parses a request message string into a request object.
+ *
+ * @param string $message Request message string.
+ *
+ * @return Request
+ */
+function parse_request($message)
+{
+    $data = _parse_message($message);
+    $matches = [];
+    if (!preg_match('/^[\S]+\s+([a-zA-Z]+:\/\/|\/).*/', $data['start-line'], $matches)) {
+        throw new \InvalidArgumentException('Invalid request string');
+    }
+    $parts = explode(' ', $data['start-line'], 3);
+    $version = isset($parts[2]) ? explode('/', $parts[2])[1] : '1.1';
+
+    $request = new Request(
+        $parts[0],
+        $matches[1] === '/' ? _parse_request_uri($parts[1], $data['headers']) : $parts[1],
+        $data['headers'],
+        $data['body'],
+        $version
+    );
+
+    return $matches[1] === '/' ? $request : $request->withRequestTarget($parts[1]);
+}
+
+/**
+ * Parses a response message string into a response object.
+ *
+ * @param string $message Response message string.
+ *
+ * @return Response
+ */
+function parse_response($message)
+{
+    $data = _parse_message($message);
+    // According to https://tools.ietf.org/html/rfc7230#section-3.1.2 the space
+    // between status-code and reason-phrase is required. But browsers accept
+    // responses without space and reason as well.
+    if (!preg_match('/^HTTP\/.* [0-9]{3}( .*|$)/', $data['start-line'])) {
+        throw new \InvalidArgumentException('Invalid response string');
+    }
+    $parts = explode(' ', $data['start-line'], 3);
+
+    return new Response(
+        $parts[1],
+        $data['headers'],
+        $data['body'],
+        explode('/', $parts[0])[1],
+        isset($parts[2]) ? $parts[2] : null
+    );
+}
+
+/**
+ * Parse a query string into an associative array.
+ *
+ * If multiple values are found for the same key, the value of that key
+ * value pair will become an array. This function does not parse nested
+ * PHP style arrays into an associative array (e.g., foo[a]=1&foo[b]=2 will
+ * be parsed into ['foo[a]' => '1', 'foo[b]' => '2']).
+ *
+ * @param string      $str         Query string to parse
+ * @param bool|string $urlEncoding How the query string is encoded
+ *
+ * @return array
+ */
+function parse_query($str, $urlEncoding = true)
+{
+    $result = [];
+
+    if ($str === '') {
+        return $result;
+    }
+
+    if ($urlEncoding === true) {
+        $decoder = function ($value) {
+            return rawurldecode(str_replace('+', ' ', $value));
+        };
+    } elseif ($urlEncoding == PHP_QUERY_RFC3986) {
+        $decoder = 'rawurldecode';
+    } elseif ($urlEncoding == PHP_QUERY_RFC1738) {
+        $decoder = 'urldecode';
+    } else {
+        $decoder = function ($str) { return $str; };
+    }
+
+    foreach (explode('&', $str) as $kvp) {
+        $parts = explode('=', $kvp, 2);
+        $key = $decoder($parts[0]);
+        $value = isset($parts[1]) ? $decoder($parts[1]) : null;
+        if (!isset($result[$key])) {
+            $result[$key] = $value;
+        } else {
+            if (!is_array($result[$key])) {
+                $result[$key] = [$result[$key]];
+            }
+            $result[$key][] = $value;
+        }
+    }
+
+    return $result;
+}
+
+/**
+ * Build a query string from an array of key value pairs.
+ *
+ * This function can use the return value of parse_query() to build a query
+ * string. This function does not modify the provided keys when an array is
+ * encountered (like http_build_query would).
+ *
+ * @param array     $params   Query string parameters.
+ * @param int|false $encoding Set to false to not encode, PHP_QUERY_RFC3986
+ *                            to encode using RFC3986, or PHP_QUERY_RFC1738
+ *                            to encode using RFC1738.
+ * @return string
+ */
+function build_query(array $params, $encoding = PHP_QUERY_RFC3986)
+{
+    if (!$params) {
+        return '';
+    }
+
+    if ($encoding === false) {
+        $encoder = function ($str) { return $str; };
+    } elseif ($encoding === PHP_QUERY_RFC3986) {
+        $encoder = 'rawurlencode';
+    } elseif ($encoding === PHP_QUERY_RFC1738) {
+        $encoder = 'urlencode';
+    } else {
+        throw new \InvalidArgumentException('Invalid type');
+    }
+
+    $qs = '';
+    foreach ($params as $k => $v) {
+        $k = $encoder($k);
+        if (!is_array($v)) {
+            $qs .= $k;
+            if ($v !== null) {
+                $qs .= '=' . $encoder($v);
+            }
+            $qs .= '&';
+        } else {
+            foreach ($v as $vv) {
+                $qs .= $k;
+                if ($vv !== null) {
+                    $qs .= '=' . $encoder($vv);
+                }
+                $qs .= '&';
+            }
+        }
+    }
+
+    return $qs ? (string) substr($qs, 0, -1) : '';
+}
+
+/**
+ * Determines the mimetype of a file by looking at its extension.
+ *
+ * @param $filename
+ *
+ * @return null|string
+ */
+function mimetype_from_filename($filename)
+{
+    return mimetype_from_extension(pathinfo($filename, PATHINFO_EXTENSION));
+}
+
+/**
+ * Maps a file extensions to a mimetype.
+ *
+ * @param $extension string The file extension.
+ *
+ * @return string|null
+ * @link http://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x/conf/mime.types
+ */
+function mimetype_from_extension($extension)
+{
+    static $mimetypes = [
+        '7z' => 'application/x-7z-compressed',
+        'aac' => 'audio/x-aac',
+        'ai' => 'application/postscript',
+        'aif' => 'audio/x-aiff',
+        'asc' => 'text/plain',
+        'asf' => 'video/x-ms-asf',
+        'atom' => 'application/atom+xml',
+        'avi' => 'video/x-msvideo',
+        'bmp' => 'image/bmp',
+        'bz2' => 'application/x-bzip2',
+        'cer' => 'application/pkix-cert',
+        'crl' => 'application/pkix-crl',
+        'crt' => 'application/x-x509-ca-cert',
+        'css' => 'text/css',
+        'csv' => 'text/csv',
+        'cu' => 'application/cu-seeme',
+        'deb' => 'application/x-debian-package',
+        'doc' => 'application/msword',
+        'docx' => 'application/vnd.openxmlformats-officedocument.wordprocessingml.document',
+        'dvi' => 'application/x-dvi',
+        'eot' => 'application/vnd.ms-fontobject',
+        'eps' => 'application/postscript',
+        'epub' => 'application/epub+zip',
+        'etx' => 'text/x-setext',
+        'flac' => 'audio/flac',
+        'flv' => 'video/x-flv',
+        'gif' => 'image/gif',
+        'gz' => 'application/gzip',
+        'htm' => 'text/html',
+        'html' => 'text/html',
+        'ico' => 'image/x-icon',
+        'ics' => 'text/calendar',
+        'ini' => 'text/plain',
+        'iso' => 'application/x-iso9660-image',
+        'jar' => 'application/java-archive',
+        'jpe' => 'image/jpeg',
+        'jpeg' => 'image/jpeg',
+        'jpg' => 'image/jpeg',
+        'js' => 'text/javascript',
+        'json' => 'application/json',
+        'latex' => 'application/x-latex',
+        'log' => 'text/plain',
+        'm4a' => 'audio/mp4',
+        'm4v' => 'video/mp4',
+        'mid' => 'audio/midi',
+        'midi' => 'audio/midi',
+        'mov' => 'video/quicktime',
+        'mp3' => 'audio/mpeg',
+        'mp4' => 'video/mp4',
+        'mp4a' => 'audio/mp4',
+        'mp4v' => 'video/mp4',
+        'mpe' => 'video/mpeg',
+        'mpeg' => 'video/mpeg',
+        'mpg' => 'video/mpeg',
+        'mpg4' => 'video/mp4',
+        'oga' => 'audio/ogg',
+        'ogg' => 'audio/ogg',
+        'ogv' => 'video/ogg',
+        'ogx' => 'application/ogg',
+        'pbm' => 'image/x-portable-bitmap',
+        'pdf' => 'application/pdf',
+        'pgm' => 'image/x-portable-graymap',
+        'png' => 'image/png',
+        'pnm' => 'image/x-portable-anymap',
+        'ppm' => 'image/x-portable-pixmap',
+        'ppt' => 'application/vnd.ms-powerpoint',
+        'pptx' => 'application/vnd.openxmlformats-officedocument.presentationml.presentation',
+        'ps' => 'application/postscript',
+        'qt' => 'video/quicktime',
+        'rar' => 'application/x-rar-compressed',
+        'ras' => 'image/x-cmu-raster',
+        'rss' => 'application/rss+xml',
+        'rtf' => 'application/rtf',
+        'sgm' => 'text/sgml',
+        'sgml' => 'text/sgml',
+        'svg' => 'image/svg+xml',
+        'swf' => 'application/x-shockwave-flash',
+        'tar' => 'application/x-tar',
+        'tif' => 'image/tiff',
+        'tiff' => 'image/tiff',
+        'torrent' => 'application/x-bittorrent',
+        'ttf' => 'application/x-font-ttf',
+        'txt' => 'text/plain',
+        'wav' => 'audio/x-wav',
+        'webm' => 'video/webm',
+        'wma' => 'audio/x-ms-wma',
+        'wmv' => 'video/x-ms-wmv',
+        'woff' => 'application/x-font-woff',
+        'wsdl' => 'application/wsdl+xml',
+        'xbm' => 'image/x-xbitmap',
+        'xls' => 'application/vnd.ms-excel',
+        'xlsx' => 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
+        'xml' => 'application/xml',
+        'xpm' => 'image/x-xpixmap',
+        'xwd' => 'image/x-xwindowdump',
+        'yaml' => 'text/yaml',
+        'yml' => 'text/yaml',
+        'zip' => 'application/zip',
+    ];
+
+    $extension = strtolower($extension);
+
+    return isset($mimetypes[$extension])
+        ? $mimetypes[$extension]
+        : null;
+}
+
+/**
+ * Parses an HTTP message into an associative array.
+ *
+ * The array contains the "start-line" key containing the start line of
+ * the message, "headers" key containing an associative array of header
+ * array values, and a "body" key containing the body of the message.
+ *
+ * @param string $message HTTP request or response to parse.
+ *
+ * @return array
+ * @internal
+ */
+function _parse_message($message)
+{
+    if (!$message) {
+        throw new \InvalidArgumentException('Invalid message');
+    }
+
+    // Iterate over each line in the message, accounting for line endings
+    $lines = preg_split('/(\\r?\\n)/', $message, -1, PREG_SPLIT_DELIM_CAPTURE);
+    $result = ['start-line' => array_shift($lines), 'headers' => [], 'body' => ''];
+    array_shift($lines);
+
+    for ($i = 0, $totalLines = count($lines); $i < $totalLines; $i += 2) {
+        $line = $lines[$i];
+        // If two line breaks were encountered, then this is the end of body
+        if (empty($line)) {
+            if ($i < $totalLines - 1) {
+                $result['body'] = implode('', array_slice($lines, $i + 2));
+            }
+            break;
+        }
+        if (strpos($line, ':')) {
+            $parts = explode(':', $line, 2);
+            $key = trim($parts[0]);
+            $value = isset($parts[1]) ? trim($parts[1]) : '';
+            $result['headers'][$key][] = $value;
+        }
+    }
+
+    return $result;
+}
+
+/**
+ * Constructs a URI for an HTTP request message.
+ *
+ * @param string $path    Path from the start-line
+ * @param array  $headers Array of headers (each value an array).
+ *
+ * @return string
+ * @internal
+ */
+function _parse_request_uri($path, array $headers)
+{
+    $hostKey = array_filter(array_keys($headers), function ($k) {
+        return strtolower($k) === 'host';
+    });
+
+    // If no host is found, then a full URI cannot be constructed.
+    if (!$hostKey) {
+        return $path;
+    }
+
+    $host = $headers[reset($hostKey)][0];
+    $scheme = substr($host, -4) === ':443' ? 'https' : 'http';
+
+    return $scheme . '://' . $host . '/' . ltrim($path, '/');
+}
+
+/** @internal */
+function _caseless_remove($keys, array $data)
+{
+    $result = [];
+
+    foreach ($keys as &$key) {
+        $key = strtolower($key);
+    }
+
+    foreach ($data as $k => $v) {
+        if (!in_array(strtolower($k), $keys)) {
+            $result[$k] = $v;
+        }
+    }
+
+    return $result;
+}
diff --git a/Postman/Postman-Mail/mailgun/vendor/guzzlehttp/psr7/src/functions_include.php b/Postman/Postman-Mail/mailgun/vendor/guzzlehttp/psr7/src/functions_include.php
new file mode 100644
index 0000000..96a4a83
--- /dev/null
+++ b/Postman/Postman-Mail/mailgun/vendor/guzzlehttp/psr7/src/functions_include.php
@@ -0,0 +1,6 @@
+<?php
+
+// Don't redefine the functions if included multiple times.
+if (!function_exists('GuzzleHttp\Psr7\str')) {
+    require __DIR__ . '/functions.php';
+}