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From: PKARP@SRI-IU.ARPA (Peter Karp)
Newsgroups: net.mail.headers
Subject: Re:     Subject: Loop control mechanisms in mailing lists
Message-ID: <1004@brl-smoke.ARPA>
Date: Mon, 17-Feb-86 14:20:21 EST
Article-I.D.: brl-smok.1004
Posted: Mon Feb 17 14:20:21 1986
Date-Received: Wed, 19-Feb-86 20:27:11 EST
Sender: news@brl-smoke.ARPA
Lines: 6

I believe that Unix Sendmail counts "Received:" lines in message headers,
assuming that it has detected a mail loop if this number gets past some
threshold.  Simple but effective...

Peter
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