(off-topic) Outlook 2003 msgids causing odd email problems

[Jonathan McKeown]

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