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Spam Filtering with Sendmail Milters and Greylisting (O'ReillyNet)

Here's an O'ReillyNet article on writing spam filters using the sendmail "milter" interface. "Milter is a scalable, easy-to-use solution for MTA-level filtering. The API is quite straightforward to use and hides very few pitfalls. It's easy to start and to develop complex filtering techniques. It is indeed a great opportunity to have it in the battle against spam and viruses."
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