Contributed by jose on from the ham-vs-spam dept.
Paul Graham's original "Plan for Spam" piece , which led to the creation of tools like bmf and ifile , works on the principles of Bayesian filtering. Simply put, interesting words are used to classify the email into its category, including "spam or not". He's written down his thoughts on Better Bayesian Filtering which will be worthwhile to study, as well.
Sendmail can be used, in conjunction with Milter , to filter spam during processing. Bogofilter has been adapted as a milter , removing the need for external processing via procmail. Other milters include MailCorral , which can work with SpamAssassin, spasm , a highly configuration spam filter with a variety of options for actions and rule imports, CanIt , yet another milter tie in, and a SpamAssassin milter , removing the need for external SA handling (which can speed things up on a busy server).
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