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From: mrose@nrtc-gremlin.arpa (Marshall Rose)
Newsgroups: comp.mail.headers
Subject: Re: rmail-reply-to-sender
Message-ID: <874@brl-adm.ARPA>
Date: Mon, 17-Nov-86 23:19:57 EST
Article-I.D.: brl-adm.874
Posted: Mon Nov 17 23:19:57 1986
Date-Received: Tue, 18-Nov-86 03:26:42 EST
Sender: news@brl-adm.ARPA
Lines: 10

Mark - there is a difference between working correctly and working.  Working
correctly is to ignore sender and return-path.  However this is not often
working.  In a perfect world with a diligent protocol police, we would
only worry about working correctly.  This proceeds from a false assumption:
there is neither perfection nor diligence in the Internet.  It is better
to know that you can fall back on sender and/or return path in case you have
to (when working on a poorly constructed message), than to just say "you
can't reply to that".  

/mtr