Spam Filtering for Mail Exchangers
I have put together a HOWTO/Guide on Spam Filtering for Mail Exchangers, covering SMTP-time junk mail filtering techniques and considerations. The document is split into into an MTA-agnostic theoretical part discussing the various concepts (such as transaction delays, greylisting, sender authorization schemes, envelope sender signatures...), followed by an implementation for the Exim 4 MTA as an appendix. Before officially releasing it with TLDP, I would like to solicit feedback, and more importantly, contributions for other MTAs such as Sendmail and Postfix.
(Submitted by Tor Slettnes Mon Aug 2, 2004 )
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