Mail::Audit itself isn't a mail filter - it's a toolkit that makes it very easy for you to build mail filters. You write a program that describes what should happen to your mail, and this replaces your procmail command in your .forward or .qmail file. Mail::Audit provides the functionality for extracting mail headers, bouncing, accepting, rejecting, forwarding, and filtering incoming mail.
WWW: http://search.cpan.org/dist/Mail-Audit/
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