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From: gillies.osbunorth@xerox.ARPA
Newsgroups: net.mail.headers
Subject: Re: Subject: Loop control mechanisms in mailing lists
Message-ID: <1003@brl-smoke.ARPA>
Date: Mon, 17-Feb-86 14:18:56 EST
Article-I.D.: brl-smok.1003
Posted: Mon Feb 17 14:18:56 1986
Date-Received: Wed, 19-Feb-86 20:27:00 EST
Sender: news@brl-smoke.ARPA
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another method of loop control used by some of our mail gateways:

(5) Each host physically appends a [post]mark to the message that
identifies it as "A message already acted on here".  Refuse to process
[kill] the message if it shows up later at the same host with one of
your [post]marks still in tact.

This is a good way for a gateway to prevent looping.  However, it won't
work if you're sending mail through a dumb gateway that strips off this
information to accomplish format conversion.

				Don Gillies