Modular Python Postfix Policy Server

Modular Python Postfix Policy Server is tool for extending Postfix
checking capabilities. It uses Postfix access policy delegation
(http://www.postfix.org/SMTPD_POLICY_README.html) to check incoming
SMTP request and accept or reject it according provided data. It can
reduce mailserver load with rejecting incorrect mail during SMTP
connection. It was made with stress to height reliability and performance
by providing caching of required data and results.

WWW: http://bimbo.fjfi.cvut.cz/ppolicy