[Mailman-Users] Subscribers Receiving Multiple Emails

Mark Sapiro mark at msapiro.net
Thu Mar 26 17:22:27 CET 2009

Nyrobi Collins wrote:

>We are having an issue with subscribers receiving three of the same emails
>every time I send an email.  It doesn't happen to every subscriber, but
>those who get multiples always get three.
>Any suggestions for how to eliminate this?

Unless the affected people are actually on the list 3 times with 3
different addresses or on 3 different lists which all get the same
post, this is almost certainly not a Mailman issue.

This is sometimes caused by rules in the user's MUA (client) filing the
same message in multiple places. Otherwise it is probably some glitch
in SMTP delivery somewhere.

The first step is to compare the chain of Received: headers in each of
the 3 message copies. Where they diverge is where the duplication

Mark Sapiro <mark at msapiro.net>        The highway is for gamblers,
San Francisco Bay Area, California    better use your sense - B. Dylan

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