clapf is a modular network filter for postfix. It includes a statistical (inverse chi-square) antispam module, the blackhole feature and Clam AntiVirus support preventing virus infection as well as a cgi and a command line interface to easily train the token database. Users may manage their own spam quarantine. SURBL support is also included. Clapf also features an experimental OCR check function and a few smart features to get rid of image spam.

http://clapf.acts.hu/

-- LucaGibelli - 10 Feb 2007