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From: Craig_Everhart@TRANSARC.COM
Newsgroups: comp.mail.sendmail
Subject: Re: Use of Errors-To:
Message-ID: <obpaQgL0BwwO1X5ZtW@transarc.com>
Date: 7 Mar 91 16:15:40 GMT
References: <1991Mar7.012743.12895@phri.nyu.edu>
Sender: daemon@ucbvax.BERKELEY.EDU
Lines: 11

I'll guess that the headers as specified in RFC 822 are meant for
UA-to-UA communication, and that the envelope was seen as being the
province of the MTA.  Seems clean enough.

Certainly there are enough UA (user agent) concerns with the meanings of
the various headers that you shouldn't overload automatic MTA processing
onto them as well.  Unfortunately, people do.  (Some of them advocate
changing all applicable headers on message redistribution, too, which I
think is a bad idea.)

		Craig