URIBL.COM is a free real-time URI blacklist (RHSBL) accessible via DNS lookups to identify spam email based on the links within the message. Continuous auto-discovery of spam URIs makes URIBL the fastest and most accurate RHSBL available!...
Open Source 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. Site includes download, news, FAQ, a...
Beware of cheap imitations! SpamCop has been protecting the internet community since 1998. Automatically file spam reports with the network administrators who can stop unsolicited email at the source. Subscribe, and filter your email bef...
Spamhaus tracks the Internet's worst Spammers, known Spam Gangs and Spam Support Services, and works with ISPs and Law Enforcement Agencies to identify and remove persistent spammers from the Internet.
SORBS anti-spam email blocking and filtering system. Tips and tricks for closing open proxy servers, along with useful tips for configuring smtp mail servers.