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Date:      Tue, 11 Sep 2007 15:08:21 +0200
From:      Jonathan McKeown <jonathan+freebsd-questions@hst.org.za>
To:        freebsd-questions@freebsd.org
Subject:   Re: (off-topic) Outlook 2003 msgids causing odd email problems
Message-ID:  <200709111508.21463.jonathan%2Bfreebsd-questions@hst.org.za>
In-Reply-To: <200709111220.09785.jonathan%2Bfreebsd-questions@hst.org.za>
References:  <200709111220.09785.jonathan%2Bfreebsd-questions@hst.org.za>

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Replying to myself,

On Tuesday 11 September 2007 12:20, Jonathan McKeown wrote:

> After much scratching of head and tearing of hair, I have finally found two
> provable instances - one in Cyrus and one in Mailman - of replies to
> messages being sent using Microsoft Outlook Service Pack 2, where Outlook
> has given the reply the same message-id as the message it is replying to -
> in flat violation of RFC{2}822. (In one case the original message, the
> read-receipt automatically generated by Outlook, the reply, and the forward
> of the reply sent when the reply didn't arrive, all had the same msg-id).

After further investigation, it appears that the message-id generated by 
Outlook 2003 has the originating host name on the RHS (after the @), unless 
the sending machine is a member of a Server 2003 AD domain in which case the 
domain name is used which increases the risk of a collision (especially if 
the LHS is copied!).

Jonathan



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