From: Wietse Venema (wietseporcupine.org)
Date: Mon May 02 2005 - 15:45:36 CDT

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Peter:
>
> I think I found a 'new' bug in postfix (it actually applies to all
> MTAs). postfix accepts a Message-Id supplied by the MUA or upstream
> origin.

Please cite the RFC paragraph that is being violated.

Please use a proper SUBJECT instead of following up within an
unrelated thread.

        Wietse

> If that Message-Id is duplicated then downstream MUAs and email
> list managers will break, and start deleting threads resp. locking up on
> attempts to thread. This applies to any message that has headers like:
>
> Message-Id: <a.dulicate.id>
> References: <a.duplicate.id>, ...
>
> this breaks at least Thunderbird and prevents threading by mailing list
> archivers. The message id could be checked by postfix and changed to
> something different if it appears in References.
>
> Peter
>
>

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