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This Perl module provides routines for checking validity of email address.
It makes several checks:
1. It checks the syntax of an email address.
2. It checks if there any MX records or A records for the domain part of
the email address.
3. It tries to connect to an email server directly via SMTP to check if
mailbox is valid. It uses a combination of MAIL and RCPT commands which
simulates sending an email. It can detect bad mailboxes in many cases.
WWW: http://search.cpan.org/dist/Mail-CheckUser/
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