p5-Mail-CheckUser This Perl module provides routines for checking validity of email address. It makes several checks: 1. it checks syntax of email address; 2. it checks if there any MX record or at least A record for domain in email address; 3. it tries to connect to email server directly via SMTP to check if mailbox is valid. Old versions of this module have performed this check via VRFY command. Now module uses another check: it uses combination of commands MAIL and RCPT which simulates fake sending of email. It can detect bas mailboxes in many cases. For example hotmail.com mailboxes can be verified with MAIL/RCPT check.
State Changed From-To: open->closed Port added, thanks!