[Mailman-Users] Duplicate posts?

[Mark Sapiro]

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