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Date:        Tue, 2 Jan 1996 09:24:35 EST
From: Eric Thomas <ERIC@LSOFT.COM>
Subject:     Re: Header to label lists (was untitled)
To: jgm+@CMU.EDU, "Eric Norman (MACC)" <EJNORMAN@macc.wisc.edu>
cc: drums@cs.utk.edu
In-Reply-To: Message of Mon, 01 Jan 96 21:48 CDT from "Eric Norman (MACC)"
             <EJNORMAN@macc.wisc.edu>

You  can identify  that a  message has  been through  a mailing  list (as
opposed to  a multi-user  alias like  your average  'postmaster' address,
which isn't really a mailing list)  by looking at the Return-Path: field.
For a mailing list it will  be either owner-xxx, xxx-request or xxx-owner
in all but a  few very rare cases. This works today  and is as widespread
as your new tag is ever likely to get. The reason vacation programs don't
handle mailing lists well is that they haven't been updated since the day
they were first compiled. I don't see how a new header would help.

  Eric