non-existent msgids & duplicate delivery suppression

Stephen Grier s.e.grier at
Fri Jun 27 11:28:27 EDT 2003

On Fri, 2003-06-27 at 14:27, David Carter wrote:
> On Fri, 27 Jun 2003, Stephen Grier wrote:
> > I have noticed that this has been happening on other occasions, where
> > lmtpd does a duplicate_check and then a duplicate_mark on zero length
> > message-ids. This raises the possibility that the server is suppressing
> > messages that are not duplicates, but merely have no message-id header.
> >
> > Has anyone else seen this happening?. If this continues to happen we may
> > have to disable duplicate delivery suppression.
> This seems quite likely. If a message doesn't contain a Message-ID, your
> mail system should really add one before it passes it on to Cyrus.
> Exim does this automatically. I don't know about other MTAs.

We use Exim here. The messages do have a Message-Id: header, but with an
empty value. I assume Exim will not add or alter the msg-id in this


Stephen Grier
Systems Developer
Computing Services
Queen Mary, University of London

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