Pkg exim4 users - May 2009 - Exim, Sympa Mailing list manager and broken threading with added Message-ID to messages with no Message-ID from Outlook

Dear list,


I am using Sympa [1], Exim 4 from Debian Lenny. Yesterday I noticed that
an answer to a message on the list was not threaded correctly. It turns
out that the message id in my copy of the original message was different
than the message id from the message of the replier.

The original message was written with Outlook.

X-Mailer: Microsoft Office Outlook, Build 11.0.5510

It looks like that Outlook does not add a message id to a message if not
delivered by Exchange [2].

Now the problem is that Sympa seems to queue(?) each message for a
recipient/subscriber of the list separately so that Exim adds a
different message id to each copy of the message for each subscriber.

Does anyone know a solution for this problem?


Thanks,

Paul


[1] https://www.sympa.org/
[2] http://www.terryfrazier.com/fullThread$msgNum=1526#msg1526
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Paul Menzel <paulepanter at users.sourceforge.net>
wrote:
> Dear list,
> I am using Sympa [1], Exim 4 from Debian Lenny. Yesterday I noticed that
> an answer to a message on the list was not threaded correctly. It turns
> out that the message id in my copy of the original message was different
> than the message id from the message of the replier.
> The original message was written with Outlook.
> X-Mailer: Microsoft Office Outlook, Build 11.0.5510
> It looks like that Outlook does not add a message id to a message if not
> delivered by Exchange [2].
> Now the problem is that Sympa seems to queue(?) each message for a
> recipient/subscriber of the list separately so that Exim adds a
> different message id to each copy of the message for each subscriber.
> Does anyone know a solution for this problem?
[...]

Hello,
The most obvious way[1] is probably to add the Message-ID before the
message is passed on to sympa.

You could use something like

warn 
[...specific conditions for messages passed on to sympa]
control = submission/sender_retain

in the ACLs to do this.

cu andreas

[1] The only other thing I can think of is making exim not add
Messsage-IDs to sympa-generated outgoing mail, but that will break
threading even worse, since the individual copies will either no
Message-Ids or differeing ones, added by the final recipient''s MTA.
-- 
`What a good friend you are to him, Dr. Maturin. His other friends are
so grateful to you.''
`I sew his ears on from time to time, sure''