9.17.6 Spam Back Ends --------------------- The spam package offers a variety of back ends for detecting spam. Each back end defines a set of methods for detecting spam (Filtering Incoming Mail, Detecting Spam in Groups), and a pair of spam and ham processors (Spam and Ham Processors).
· Blacklists and Whitelists · BBDB Whitelists · Gmane Spam Reporting · Anti-spam Hashcash Payments · Blackholes · Regular Expressions Header Matching · Bogofilter · SpamAssassin back end · ifile spam filtering · Spam Statistics Filtering · SpamOracle