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RFC 822 Question

In article <1993Aug12.150420.6667@bard.cray.com> btd@yorick.uk.cray.com
(Bryan T Dongray) writes:
>Actually this "From " line is incredibly useful when you *really* want
>to know where the message really was from, as the "From: " can easily
>be a user generated line, whereas the "From " address is the MAIL FROM:
>address, which is *normally* more accurate.

That's what "Return-Path:" is for.

>OK, I know anyone with a little knowledge on UNIX can easily fake the
>whole message header, but many mail applications allow the "From:" to
>be set by the user - disaster!

A mail application *should* permit the "From:" field to be set.  It
should also check whether "From:"  corresponds to the person sending
the message, and if not add a "Sender:" which does.

Ok, so your basic MUA probably doesn't want to go the effort, but
sophisticated MUAs should provide this functionality, and anything
doing fancy stuff---list explosion for example---has to get this right.

Tim.
--
Tim Goodwin | tim@pipex.net  or | Usenet will also be converted to OSI-based
PIPEX Ltd   | tim@unipalm.co.uk | services in the long term - B Plattner et al.

Original headers:

From: tim@pipex.net (Tim Goodwin)
Newsgroups: comp.mail.headers
Subject: Re: RFC 822 Question
Date: 17 Aug 1993 18:04:05 +0100
Organization: Pipex Ltd, Cambridge, UK.
Message-ID: <24r326$p5s@tank.pipex.net>
References: <dugan.744717165@joplin.wri.com>
  <1993Aug8.095015.7786@cee.hw.ac.uk> <2440ehINNf08@network.ucsd.edu>
  <1993Aug12.150420.6667@bard.cray.com>

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