
Client side spam filters are used with your mail client rather than working on the mail server. They are useful if your ISP either cannot filter all of their spam or refuse to. Some client side filters will work with any mail client whereas others are built as plugins for a particular program.
Animail - animail.sourceforge.net/ - POP3, IMAP
Statistical Spam Filter - www.tc.umn.edu/~hause011/article/Statistical_spam_filter.html - Bayes. Awk.
IMAPAssassin - sourceforge.net/projects/imapassassin/ - SpamAssassin for IMAP clients
Bayesian Mail Filter - sourceforge.net/projects/bmf/ - Bayes
Pigmail - pigmail.sourceforge.net/ - Bayes
SpamSense - sourceforge.net/projects/spamsense/ - Bayes
iFile - www.nongnu.org/ifile/
BSpam - bspam.sourceforge.net/ - Bayes
Spam Detector - www.cs.cmu.edu/~jcl/programs/hasher/hasher.html - Perl
RMail Spam Filter - www.seas.harvard.edu/climate/eli/Downloads/rmail-spam-filter/
Bogofilter - bogofilter.sourceforge.net/
Spamprobe - spamprobe.sourceforge.net/
Bunny Spam Filter - bunny.sourceforge.net/
BSFilter - bsfilter.org/index-e.html
P3Scan - p3scan.sourceforge.net/
Spamato - www.spamato.net/ - Mozilla Mail plugin
Tagspam - copsewood.net/tagspam/
MailWasher Pro - www.firetrust.com/en/products/mailwasher-pro
Remove items identified as spam from the server before you download them.
Mailfilter - mailfilter.sourceforge.net/
KShowmail - sourceforge.net/projects/kshowmail/ - KDE
PopMail - www.sromero.org/wiki/doku.php/programacion:programas:popmail
SaveMyModem - savemymodem.sourceforge.net/
SpamTrapPhp - jpll.free.fr/phpfiles/spamtrap.php
phPOP3clean - phpop3clean.sourceforge.net/ - PHP and MySQL
Pop3eye - www.efn.org/~bmoats/pop3eye.php
The links here are to applications that use procmail as a part of their solution, or to pages explaining how to write procmail spam filters.
SpamBouncer - www.spambouncer.org/
spam-catchers - alcor.concordia.ca/topics/email/auto/procmail/spam/
junkfilter - junkfilter.zer0.org/
Foiling spam with Procmail - lipas.uwasa.fi/~ts/info/spamfoil.html
procmail library – UBE plugin - pm-lib.sourceforge.net/
Bob's Spam Filter - cse.taylor.edu/~bbell/spam-filter/
SPASTIC - spastic.sourceforge.net/
Fighting spam with procmail and Squirrelmail - alge.anart.no/~andersgo/spam/
Whitelist-based spam filtering - impressive.net/people/gerald/2000/12/spam-filtering.html
SpamOracle - cristal.inria.fr/~xleroy/software.html
Undertaker - https://www.bouissou.net/wws/d_read/spamcombat/Undertaker
Spamdealer - jidanni.org/comp/spam/spamdealer.html
Spam Cap - www.toyz.org/cgi-bin/wiki.cgi?SpamCap
Quick Spam Filter - www.ivarch.com/programs/qsf/
ReceivedIP - www.johncon.com/john/receivedIP/
Stochastic UCE Detection - www.johncon.com/john/StochasticUCEDetection/
SpamTestBuddy - www.pc-tools.net/unix/spamtestbuddy/