qpsmtpd - 0.94-4 main

This is a replacement SMTP daemon which installs alongside a mail delivery
and transport system such as Exim, Postfix or Qmail, or used as an SMTP
proxy for a remote/DMZ MTA.
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The qpsmtpd damon emphasizes spam detection during the SMTP transaction,
attempting to reach spam/nonspam decisions prior to accepting each message,
thereby eliminating much bounce/forgery blowback. It exploits its visbility
into the network transaction to detect certain behaviors often exhibited by
spam sending agents.
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Qpsmtpd is written in Perl, with an extensive plugin API making it easy to
add new features or replace functional components.