SpamAssassin
A mail filter, written in Perl, to identify spam using a wide range of heuristic tests on mail headers and body text. Free software. Can be used as a standalone mail filter, or from procmail.
SpamButcher
Fuzzy-logic based anti-spam filter for Windows systems.
0Spam.com
Free antispam service for pop, Yahoo, and Hotmail accounts supporting multiple languages.
SpamFilter for ISP
Proxy software for incomming mail.
SpamFixer
SpamFixer is an anti-spam filtering solution for small businesses as well as enterprise sized organizations.
SpamForce
Provides anti-spam solutions for home and corporate environments.
SpamStopsHere
An email filtering service for businesses or individual domains. 30 day trial offered.
SpamTrap
Australian POP3 email spam filtering service requiring no software.
Stop The Spam
Commercial filters for spam reduction.
Vetomail
Spam blocker for Outlook and Outlook Express.
Vipul's Razor
Collaborative spam filtering network allowing users to report and filter out matching spam.
WhiteICE
Provides filtered web-based e-mail accounts and web space.
Yahoo Groups: I Did Not Get My Email
A mailing list run by Network Advertising Initiative (NAI) about false positives in anti-spam software.
Activator Mail
Virus scanning and spam prevention based on blacklists and user feedback.
Anti Spam Software
Provides anti spam software with server based email and web security features, email and spam filtering software for Network Administrators.
AppRiver
Filtering solutions for Novell GroupWise and Microsoft Exchange.
ASSP
Anti-Spam SMTP Proxy implementing platform independent email filtering services.
Atqui Spam Filter
Filters spam email from current e-mail address of user.
BayEmail
Email filtering service.
Blockallspam
Offers a "reply first" approach email solutions to protect your mailbox.
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