Get Me Off Your Fucking Mailing List (2005) [pdf]

> Mail Avenger is a highly-configurable, MTA-independent SMTP server daemon. It lets users run messages through filters like ClamAV and SpamAssassin during SMTP transactions, so the server can reject mail before assuming responsibility for its delivery. Other unique features include TCP SYN fingerprint and network route recording, verification of sender addresses through SMTP callbacks, SPF (sender policy framework) as a general policy language, qmail-style control over both SMTP-level behavior and local delivery of extension addresses, mail-bomb protection, integration with kernel firewalls, and more.

If you want to test it sign up at http://www.joinjune.com

“After receiving a spam email from the International Journal of Advanced Computer Technology, Dr. Peter Vamplew of Federation University Australia’s School of Engineering and Information Technology sent the anti-spam article as a reply to the spam email without any other message, expecting that they might open it and read it, but not that it would be considered for publication.

To his surprise, the journal accepted the paper and sent him an acceptance email that had two PDF attachments. One was a formal statement of acceptance and the second was the reviewer report.”