| Spamhaus.org |
Spamhaus.org is a free realtime DNS-based database of IP addresses of verified spammers, spam gangs and spam services. |
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| SORBS
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SORBS |
The Spam and Open Relay Blocking System (SORBS) was conceived as an anti-spam project where a daemon would check "on-the-fly", all servers from which it received email to determine if that email was sent via various types of proxy and open-relay servers. The daemon was not particularly well written and served as a lesson in programming for its original author, Matthew Sullivan.
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| Spamassassin |
The Apache SpamAssassin Project The Powerful #1 Open-Source Spam Filter
SpamAssassin is a mail filter which attempts to identify spam using
a variety of mechanisms including text analysis, Bayesian filtering,
DNS blocklists, and collaborative filtering databases.
Using its rule base, it uses a wide range of heuristic tests on mail
headers and body text to identify "spam", also known as unsolicited
commercial email. |
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