Email Spam Filtering Shareware for Windows

Active Email Monitor
Spam filter and email checker capable of monitoring multiple accounts.
Garbage Manager
Junk email filter particularly created for America Online Mail. Offers customizable filters.
JOC Email Checker
Helps eliminate unwanted emails such as spam directly from the POP3 server without the need for downloading.
SpamAI
POP3 spam filter compatible with POP3 email clients including Outlook, Outlook Express, Vista Microsoft mail, Thunderbird, Eudora, Mozilla, TheBat!, and PocoMail.