mail/p5-Mail-CheckUser 1.24 DragonFly

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.