[Mailman-Users] Random duplicate message to subscribers

Ralf Hildebrandt Ralf.Hildebrandt at charite.de
Mon May 7 23:31:23 CEST 2007

* Jason LaMar <jrlamar at owu.edu>:
> We have a fairly large list (more than 26,000 subscribers), and recently it
> appears a very small fraction of the subscribers have started receiving
> duplicate messages -- sometimes as many as a dozen or more. This behavior
> just started happening within the last couple of weeks, and it seems to only
> impact a minute and random subset of the subscribers. Anyone seen similar
> behavior or have suggestions on the most effective way to troubleshoot this?

Analyse if these messages are truly identical. Meaning: Save them,
diff them. Look at the differences.

In some cases mail gets stuck between a virusscanner gateway and an
MTA, and although the virussanner gateways returns a tempfail, it may
STILL forward the mail -- thus leading in a massive multiplication of mail.

Ralf Hildebrandt (i.A. des IT-Zentrums)         Ralf.Hildebrandt at charite.de
Charite - Universitätsmedizin Berlin            Tel.  +49 (0)30-450 570-155
Gemeinsame Einrichtung von FU- und HU-Berlin    Fax.  +49 (0)30-450 570-962
IT-Zentrum Standort CBF                    send no mail to plonk at charite.de

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