Spam Filtering for Mail Exchangers:
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# 1. Purpose of this Document

This document discusses various highly effective and low impact ways to weed out spam and malware during incoming SMTP transactions in a mail exchanger (MX host), with an added emphasis on eliminating so-called Collateral Spam.

The discussions are conceptual in nature, but a sample implementation is provided using the Exim MTA and other specific software tools. Miscellaneous other bigotry is expressed throughout.

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