clapf is an email content filter application. It includes a statistical (inverse chi-square) anti-spam module, interfaces to several anti-virus products, a minefield (blackhole), spam quarantine, support for various RBL lists, training utilities, and much more. It can be used as an after queue content filter with Postfix (including as an appliance) or via a local delivery agent (LDA), preferably maildrop.
License: zlib/libpng License
Changes:
A few bugs related to whitelisting, infected emails, missing training parts, and purge scripts were fixed. Backscatter detection, language detection, and some spamdrop enhancements were added. The spamsum project was incorporated.
