Spam filtering
I've been working on a spam filtering system for work which uses sendmail and procmail. I got fed up with clunky commercial systems which cost a fortune and don't allow any sophisticated pattern matching. After spending ages scouring the procmail list and the sendmail faqs, I've come up with a system to do what I want. I'm going to write it up and put it on the site sometime. It'll be at sendmail.html.
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