Path: utzoo!utgpu!watserv1!watmath!att!dptg!ulysses!andante!princeton!udel!wuarchive!usc!ucsd!ucbvax!TRANSARC.COM!Craig_Everhart
From: Craig_Everhart@TRANSARC.COM
Newsgroups: comp.mail.misc
Subject: Re: Procedure for adding headers?
Message-ID: <sbIeEMv0BwwOA_4WMV@transarc.com>
Date: 27 Nov 90 17:36:24 GMT
References: <1990Nov21.171657.17208@Think.COM>
Sender: daemon@ucbvax.BERKELEY.EDU
Lines: 11

Whoops; I meant RFC 1123, not RFC 1023.

Also, the Return-path: header isn't updated by the MTA.  It is not
present on a message in transit.  Rather, it is added at final delivery
time by the final delivery agent, and its content is just the
out-of-band envelope-from address information.  This information is
transmitted over SMTP, for example, via the MAIL FROM: command.  Other
protocols have other mechanisms for carrying this out-of-band
envelope-from address.

		Craig