For those of you who are into RFC's here's an interesting idea towards
validating SMTP sender information.
Title : Designated Senders Protocol A Way to Identify Hosts
Authorized to Send SMTP Traffic
Author(s) : G. Fecyk
Filename : draft-fecyk-dsprotocol-00.txt
Pages : 17
Date : 2003-3-27
This document describes a proposed standard for identifying host
computer systems designated as Simple Mail Transfer Protocol (SMTP)
clients for an Internet domain or host through Domain Name System
(DNS). This identification allows SMTP servers to verify if a
connecting client is allowed to make outgoing SMTP connections on
behalf of the client's domain.
A URL for this Internet-Draft is:
http://www.ietf.org/internet-drafts/draft-fecyk-dsprotocol-00.txt
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