- BlackMail Anti Spam Mailer Daemon
- A highly configurable SMTP mail filter that runs at a system level as a proxy to your existing mailer. - Camram
- Anti-spam system uses proof of work and digital signature techniques to apply the concept of postal metering to an electronic, peer-to-peer model of postage. - Fight Junk Mail
- Two packages to help combat Internet spam. - Infinite Ink's Mail Filtering and Robots
 - junkfilter
- Procmail-based junk email filter system for filtering junk from Cyber Promotions, Nancynet, Quantcom, and more. - Sam Spade
- Web interface to many network tools, including traceroute, dig, whois, secure web browser, URL decipherer. - Spambot Beware
- Help on how to hide your email address on web pages. Also shows ways to detect and harass spambots. - SpamPal
- Mail classification programme for Windows that can help separate your spam from the mail you really want to read. - Stop Messenger Spam
- Offers downloadable software to eliminate messenger spam in Windows, as well as instructions on disabling it manually. - Using check_* in sendmail 8.8
- Rulesets for validating RCPT, MAIL, check_compat, etc.
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