SpamJam

SpamJam is a personal antispam program compatible with almost any POP3 mail server and client software. SpamJam operates on your PC as a local mail proxy and ensures that spam is never downloaded to your PC. Filtering rules can utilize both binary logic and probabilistic approach, and can be organized into a hierarchical tree of an arbitrary level of complexity. Full control over message retrieval/deletion. Plugins support, including automatic learning for better spam recognition.

Requirements:

Windows 95/98/Me/NT/2000/XP/2003 Server