Mailvisa 1.0.0 (by Robbert Haarman)
mailvisa is a bayesian spam filter, inspired by Paul Graham's A Plan For Spam

Bogofilter 1.1.3 (by Eric S. Raymond)
Bogofilter is a Bayesian spam filter

SpamBayes 1.1a3 (by SpamBayes Team)
SpamBayes is a Bayesian anti-spam classifier written in Python

Quick Spam Filter 1.2.1 (by Andrew Wood)
Quick Spam Filter (QSF) is an Open Source email classification filter

Web Filter 0.96 (by Jem Berkes)
webfilt is not a spam filter, but provides a generic web-based interface for Bayesian-style UNIX filters that need occasional trainin

webfilt 0.96 (by Jem Berkes)
webfilt is not a spam filter, but provides a generic web-based interface for Bayesian-style UNIX filters that need occasional trainin

PASP 3a2 (by Josiah Carlson)
PASP is a Bayesian-like spam filter that can be used as a POP3 proxy.

You can run in two ways PASP.

1

SpamAssassin 3.1.7 (by SpamAssassin Team)
SpamAssassin project is a mature, widely-deployed open source project that serves as a mail filter to identify spam, also known as un

dbacl 1.12 (by Laird Breyer)
dbacl is a digramic Bayesian text classifier

SpamProbe 1.4b (by Brian Burton)
SpamProbe operates on a different basis entirely

TclMilter 1.0 (by Michael Kirkham)
TclMilter is a package for Tcl (written in C) that implements an interface to SendMail's Milter (Mail Filter) API for developing cust

avelsieve 1.9.7 (by Alexandros Vellis)
Avelsieve or, verbosely, "SIEVE Mail Filters Plugin for Squirrelmail" is a Squirrelmail plugin for creating SIEVE scripts on a Cyrus

t-prot 2.2 (by Jochen Striepe)
t-prot (TOFU Protection) is a filter which improves the readability of email messages and Usenet posts by hiding some of their annoyi

smf-zombie 1.0.0 (by Eugene Kurmanin)
smf-zombie is a SendmailTM filter for SPAM and virus filtration from zombie PC.
More than 80% of SPAM is going from the infected Wi

OpenProtect 5.0.4 (by OpenComputing)