There's a bug in Eudora 4.1 that can lead to duplication of the Message-ID
header in, hmm, replies I think.  This should be covered in the LSTSRV-L
archives...but the bottom line is that the originator of the message
(looks like the moderator in this case) needs to upgrade his Eudora.

On Mon, 7 May 2001 15:28:25 -0400 John L. Mottl said:
>Getting theses errors after my moderator has OK'ed a message.  Any ideas?
>
>
>
>An error  occurred while processing file  12070 from MAILER@listserver:
>"Mail message sent to the LISTSERV address contains invalid RFC822 fields
>and
>could not be parsed successfully".
>
>RFC822 parser messages follow:
>
><W> MESSAGE-ID field duplicated. Last occurrence was retained.
>
>------------------- Message causing the problem (87 lines)
>--------------------
>Return-Path: <[log in to unmask]>
>Received: from 216.93.66.201 by List Server (SMTPL release 1.0d) with TCP;
>Mon, 7 May 2001 10:33:49 -0400
>Received: from moderator (d10.as6.mpls.mn.pclink.com [206.11.2.127])
> by mail2.mx.voyager.net (8.10.2/8.10.2) with SMTP id f47EqvL44028
> for <LISTSERV@Listserver>; Mon, 7 May 2001 10:52:58 -0400 (EDT)
>Message-Id: <[log in to unmask]>
>Message-Id: <[log in to unmask]>
>X-Sender: [log in to unmask]
>X-Mailer: QUALCOMM Windows Eudora Pro Version 4.1
>Date: Mon, 07 May 2001 08:08:42 -0500
>
>
>Thanks in Advance....
>
>John L. Mottl