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http://www.sendmail.org/~ca/email/relayingdenied.html
Instructions for configuring Sendmail 8.8/8.9-8.12 to prevent relaying and reject spam.
http://www.spamshield.org/
Sendmail add-on that provides rate control and volume limits for Unix-based mail servers. Can stop spam from ISP's own customers, and mail bombers.
http://www.arachnoid.com/lutusp/antispam.html
Instructions to automatically filter your e-mail, defend your site from exploitation by the spammers
http://www.informatik.uni-kiel.de/~ca/email/check.html
sendmail 8.8: using the check_* rules to prohibit unauthorized relaying through your sendmail server and to reject UBE from well known addresses
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