A simple perl mail filter.
spamf is a simple mail filter based on Mail::Audit, with all configuration done through a config file; no perl required. It supports whitelists, blacklists, and filtering into folders based on regexps in various email headers. Spams also has content-based spam detection, similar to what a lot of people do with procmail. The user can set the spam threshold as well as specifying weighted keywords to look for.
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