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Path: utzoo!watmath!clyde!burl!hou3c!Margulies@CISL-SERVICE-MULTICS.ARPA
From: Margulies@CISL-SERVICE-MULTICS.ARPA ("Benson I. Margulies")
Newsgroups: net.mail.headers
Subject: parsing headers
Message-ID: <840821154949.966446@CISL-SERVICE-MULTICS.ARPA>
Date: Tue, 21-Aug-84 11:49:00 EDT
Article-I.D.: hou3c.769
Posted: Tue Aug 21 11:49:00 1984
Date-Received: Fri, 24-Aug-84 04:08:34 EDT
Sender: ka@hou3c.UUCP (Kenneth Almquist)
Lines: 9
To: Header-People@MIT-MC.ARPA

I disagree with Mr.Crispin's comments.  There is a distinction between
text and envelope.  However, a mail header is a sensible printed
representation of the envelope of a new, outgoing message.  It is also a
sensible representation to edit.

Multics allows users to "edit" the header, parses it, and then carefully
prevents the user from forging those fields that are (a) part of the
envelope and (b) a communication from agent to agent rather than from
user to user.