- 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 program 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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