Spam Filtering

Active Email Monitor
Check multiple accounts for new email and protect them from virus and Spam also enables you to create message filters. [Win 95/98/Me/NT/2000]
http://www.vicman.net/emailmon/

Apocgraphy
Software that works with a current e-mail reader, analyzing e-mail and protecting against a full range spam, hoaxes, viruses and privacy hazards.
http://www.apocgraphy.com/

Aura
Email client that will detect and eliminate spam messages. Features include the ability to archive, print, log messages, and record email addresses in the built-in address book. [Win 95/98/Me/NT/2000]
http://www.jimjams.com/aura/index.html

CC Email Checker
Used to check POP3 email accounts, delete mail remotely and anti spam mail. It's also a Klez removal tool.
http://www.yzsoft.com/cc-email-checker.htm

Email Address Encryptor
Software prevents spammer software from extracting email address on webpage.
http://www.language-museum.com/eae/

Garbage Man
Shareware email filter add-on for America Online. With fully customizable filters, to rid the mailbox of Spam and junk email. [Win 95/98/Me/NT/2000]
http://www.waveop.com/garbageman/index.htm

GIANT Company Software, Inc. - Spam Inspector
Fight unsolicited commercial junk mail. Blocks 100% unwanted junk mail. Report spammers and bounce messages.
http://www.spaminspector.com/

Internet Drummer!
Check multiple POP3 accounts and delete spam remotely from server before downloading to e-mail client. Spam filters, new mail notifiers and URL monitoring available.
http://www.xemico.com/drummer/

JOC Email Checker
Lets you check your POP3 email accounts for unwanted messages. [Win95/98/Me/NT]
http://www.jocsoft.com/jec/

MailScan
Email previewer, and spam message filter. [Win95/98/Me/NT/2000]
http://www.nehuenmultimedia.com.ar/html/product_0.html

Spam Buster
An email filtering utility. It deletes junk from a POP account. It can check up to twelve accounts, and notifies when new mail arrives. The registered version removes advertisements. [Win95/98/Me/NT/2000]
http://www.contactplus.com/products/spam/

SpamAI
Runs under Windows and supports multiple users each with multiple email accounts on PC, Mac, and Linux via built-in POP3 server, integrated spam filtering, and web browser interface.
http://www.spamai.com/

SpamFilter for Windows
Eudora anti-spam filter plugin, with RBL support and several spam prevention databases including maps. Product specifications, screenshots, downloads, and registration.
http://www.nehuenmultimedia.com.ar/html/spamfilter.html

SpamKiller
Easiest to use anti-Spam tool available to Windows users. [Win95/98/Me/NT/2000]
http://www.spamkiller.com/

SpamPepper
Spam blocking for POP accounts without using filters. Valid senders register through a secure protocol to allow their mail through.
http://www.spampepper.com/

Vanquish
Complete anti-spam solution, featuring no filters or complex rules with three levels of protection. Supports any POP3 compliant mail program: Outlook, Outlook Express, Eudora, Netscape, and Opera (M2). [Windows 98/NT/Me/2000/XP]
http://www.vanquish.com/

Vote4Mail
Email filter and checker that will preview all new email messages. View the contents of the email message, before it gets to the email program. [Win95/98/Me/NT/2000]
http://www.vote4mail.com/