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SpamShield: A Perl-Based Spam Filter for sendmail (O'Reilly)
Glenn Graham
introduces SpamShield on O'Reilly.
"The science of spam (if you can call it that) has taught us one thing: spam leaves a definite "calling card" in the system logs. This calling card is generally repetitive enough that the process of tracking spam may be automated. Based on this theory, a brilliant programmer by the name of Kai Schlichting wrote a Perl-based program called SpamShield."
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