SpamWeed POP3 Edition 2.9 SR7 Build 1037 

SpamWeed is an innovative spam filter for Outlook Express and all other POP3 e-mail clients (Outlook, Eudora, Incredimail, Pegasus Mail, Pocomail, Netscape Mail, Mozilla, and more). It uses a combination of Bayesian statistical classification, auto-generated white list, and other state-of-the-art technologies. It can block over 95% spam with almost no false positives. E-mails classified as spam are placed in a quarantine area and can be safely retrieved if necessary. While it's powerful and intelligent, it's also very easy to install and requires almost no maintenance.