From: Victor Duchovni (Victor.DuchovniMorganStanley.com)
Date: Fri Dec 01 2006 - 15:44:18 CST

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On Fri, Dec 01, 2006 at 10:34:38PM +0100, Tomasz Grobelny wrote:

> Dnia Friday, 1 of December 2006 22:26, Ralf Hildebrandt napisa??:
> > * Tomasz Grobelny <tomaszgrobelny.oswiecenia.net>:
> > > In my logs I found this:
> > >
> > > Nov 27 20:34:45 serwerek postfix/cleanup[8069]: D90AF36B1:
> > > message-id=<20061127193445.D90AF36B1poczta.oswiecenia.net>
> > > Nov 27 20:34:45 serwerek postfix/qmgr[22561]: D90AF36B1: from=<>,
> > > size=5909, nrcpt=1 (queue active)
> > >
> > > I guess it is locally generated message.
> >
> > Don't guess, grep:
> >
> > grep D90AF36B1 /var/log/mail*
> That's what I did. The above are the first two lines of output. Later there
> are 450 replies from destination server. I also tried my logs in archiv and
> nothing more is known about D90AF36B1. But something must have generated this
> message, if it wasn't external host (since that would have been stated in the
> logs) then, by elimination, it must have been a local process. Am I right?
> And if so, which one?

It is almost certainly a bounce, the empty envelope sender is a give-away.
These are generated by Postfix and so don't have any origin logging in
Postfix releases prior to 2.3. With 2.3 and later you see:

    Dec 1 00:19:03 amnesiac postfix/bounce[26862]: 5426ACC81:
            sender non-delivery notification: 7446BCD68

This means that 7446BCD68 is a bounce notice for non-deliveries of
5426ACC81.

--
        Viktor.

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