[Mailman-Users] Duplicate posts?

Robert P. Schwartz rpschwar at knology.net
Thu Nov 24 00:31:12 CET 2011

I seem to have the same problem.  It only happens sometimes and to different

Robert P. Schwartz
206 Cedar Pond Drive
Madison, AL 35757
Phone: 256.830.2933
Cell:      256.509.2981
E-mail:  rpschwar at knology.net
-----Original Message-----
From: mailman-users-bounces+rpschwar=knology.net at python.org
[mailto:mailman-users-bounces+rpschwar=knology.net at python.org] On Behalf Of
Carlos Palomino
Sent: Wednesday, November 23, 2011 12:09 PM
To: Mailman-Users at python.org
Subject: Re: [Mailman-Users] Duplicate posts?

It appears they are replying to all, as in the few header samples I've seen,
there are two instances of the group address (in the To and CC fields).

I have the setting checked to filter out duplicates, but still receiving
Not sure how to handle this, as it seems to be on the user's end.


On Nov 23, 2011, at 10:46 AM, Mark Sapiro wrote:

Mailman Admin wrote:

> On 2011-11-23 11:11, Carlos Palomino wrote:
>> Several subscribers of my list are complaining of duplicate posts.  They
say it happens "only sometimes".
>> Are there any common reasons for such occurrences?  I don't experience
this on my test-member account or in my regularly subscribed address, so
it's difficult to track down.
>> Any ideas are appreciated.
> Perhaps this comes with users replying to all.
> So they send their reply to the user and the list.

This will cause a duplicate if and only if the "nodups" setting of the
recipient who is also directly addressed is off. In a default
installation, this setting defaults to On for new subscribers, but the
list admin can change it (new_member_options -> Filter out duplicate
messages to list members (if possible)), and individual members can
change their own settings

Other possibilities include cross posts to multiple lists of which the
recipient is a member, and duplication in the delivery chain after the
post has left Mailman. The latter may be detectable by comparing the
Received: header chain of the two received messages.

Another possibility is duplication caused by filtering/sorting rules in
the recipient's MUA. Depending on the exact rules, this could affect
only some posts, but would not likely affect more than one user.

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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