mailavenger spammer
Mail Avenger
The spam extermination project

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.

On-line documentation:

Useful external links:


Please email questions, comments, testimonials, and bug reports to the author (preferably with the words "mail avenger" in the email subject).

Mail Avenger is brought to you by David Mazières of the Stanford Secure Computer Systems group.

Logo credit: Lori Bode, Squink Industries.