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.