misterious duplicate message-id

Gabriele Bulfon gbulfon at sonicle.com
Thu May 7 08:24:18 EDT 2009

...the "fix" is to use Exchange?!?!?!?!?!?! My users use Cyrus+Postfix+Solaris10!!!!
Should I convert all my installations to Exchange?????
...there must be another solution, come on....
Gabriele Bulfon - Sonicle S.r.l.
Tel +39 028246016 Int. 30 - Fax +39 028243880
Via Felice Cavallotti 16 - 20089, Rozzano - Milano - ITALY
Da: Adam Tauno Williams <awilliam at whitemice.org>
A: info-cyrus at lists.andrew.cmu.edu
Data: 7 maggio 2009 16.19.46 CEST
Oggetto: Re: misterious duplicate message-id
On Thu, 2009-05-07 at 15:45 +0200, Sebastian Hagedorn wrote:
> --On 7. Mai 2009 13:13:24 +0200 Gabriele Bulfon <gbulfon at sonicle.com> wrote:
> > as a follow up to my "finding by message id" message, I found the reason
> > why that message was silently discarded: for 3 times that Outlook user
> > could send an email with the exact same message-id generated by Outlook!
> > How is it possible?!
> That's a known Outlook bug. I don't recall the precise circumstances, but
> I've seen that again and again.
If you do a re-send in Outlook it seems to resend the *exact* message,
including Message-ID.  The "fix" for this is to use M$-Exchange 2000 SP1
or later;  their MTA (on the server) rewrites the Message-ID of the
submitted message to a unique value.
Someone told me there is an issue with re-using Message-IDs in the DSN
functionality too, but I've never seen that one.
OpenGroupware developer: awilliam at whitemice.org
OpenGroupare & Cyrus IMAPd documenation @
Cyrus Home Page: http://cyrusimap.web.cmu.edu/
Cyrus Wiki/FAQ: http://cyrusimap.web.cmu.edu/twiki
List Archives/Info: http://asg.web.cmu.edu/cyrus/mailing-list.html
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