Sandi Gruver wrote:

>Members on List A and on List B only receive one copy of a message posted to 
>both lists.
>They want to know why.


Do they receive messages posted individually to either list?


>Somewhere, awhile ago I found that this is a Microsoft Outlook 'feature' owing 
>to the lack of message numbering in Mailman, but I searched the Mailman 
>archives this afternoon without success in finding any documentation on the 
>reason this happens.


For gmail users, this may be another manifestation of the issue
discussed at <http://wiki.list.org/x/2IA9>


>Any ideas where this is?
> 
>(We happily run Mailman 2.1.5.1 on RedHat Linux)


If the issue with Outlook can be mitigated by having a message # in the
Subject: header, current Mailman supports that.

If the issue is caused by the two messages having the same Message-ID,
Mailman is doing the right thing by not munging the Message-ID of the
incoming message. There may be some setting in Outlook to avoid this,
but I can't help with that.
 
-- 
Mark Sapiro <[email protected]>        The highway is for gamblers,
San Francisco Bay Area, California    better use your sense - B. Dylan

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