Abstract of the Internet Draft
(http://www.ietf.org/internet-drafts/draft-pelletier-smtp-trust-00.txt):
Abstract
This document defines an SMTP service extension [ESMTP] whereby an
SMTP client may establish a trust relationship with the server
attesting its confidence in the validity of the originator of a
message. This confidence, or its absence, can then be used to
mitigate the cost of undesirable messages (primarily spam) without
disrupting operations between, or with, SMTP implementations not
supporting the extension.
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