best free Anti-spam programs downloads

Anti-spam programs:
To prevent e-mail spam, both end users and administrators of e-mail systems use various anti-spam techniques. Some of these techniques have been embedded in products, services and software to ease the burden on users and administrators. No one technique is a complete solution to the spam problem, and each has trade-offs between incorrectly rejecting legitimate e-mail vs. not rejecting all spam, and the associated costs in time and effort.

Here are some FREE Anti-spam programs available :.

1. K9 - http://www.keir.net/k9.html .
   
2. MailWasher- http://www.mailwasher.net/
3. POPFile - http://popfile.sourceforge.net/
4. SpamBayes - http://spambayes.sourceforge.net/