One of the best that works as a proxy mail server for use with any POP email client.
Pros & Cons:
POPFile was one of the first Bayesian filters and is still one of the best. It works as a proxy mail server so that it can be used with any POP email client.
Setup is reasonably straightforward for experienced users but beginners may be better off with MailWasher.
POPFile supports the following protocols: POP3, SSL POP3, IMAP, HTTP (MSN, Yahoo, AOL), Exchange (with Outclass extension).
For Windows and Mac OS X, POPFile comes with an installer that helps you setup POPFile and get started. The Cross Platform version can be used on any platform where Perl and the necessary modules are installed.
POPFile was reviewed by Gizmos Freeware on based on version 1.1.3.