[Mailman-Users] duplicate messages

[Ryan Stasel]

On Jan 5, 2010, at 06:59 , Mark Sapiro wrote:

> Ryan Stasel wrote:
>> 
>> I previously was running a series of lists on a Mac OS 10.4 Server, which I believe runs Mailman 2.1.3. And there were no real problems with duplicate messages. 
>> 
>> I have just now updated to 10.6.2, which runs Mailman 2.1.12rc1, and Dovecot (which I wouldn't think would impact anything). And yeah, already had to patch for the admindb error. 
>> 
> [...]
>> 
>> Okay, then I have a list called "Everyone" that has the above lists as members. 
>> 
>> In 10.4, with Mailman 2.1.3, if someone emailed to "everyone" I only got one copy of that message. 
>> 
>> Now in 10.6.2, with Mailman 2.1.12rc1, if I email to everyone, I get multiples. If I'm only a member of 2 of the "child" lists, I get two copies. If I'm a member of 4 of those children, I get 4 copies. 
>> 
>> Again, nodups is on. I'm really quite lost as to why this is happening. 
> 
> 
> This is the normal behavior for umbrella lists and has been since
> before 2.1.3.

Okay.

> 
> 
> Possibilities include:
> 
> 1) Apple had a patch in their 2.1.3 and removed it in their 2.1.11rc1
> (this is only a conjecture - I don't know this).

Could be, but I'd have to doubt it. 

> 
> 2) something in the outgoing MTA to you path that used to deliver only
> 1 of multiple messages with duplicate message-ids changed and is no
> longer dropping dups.

This looks like the case. It looks like Dovecot doesn't have any kind of duplicate suppression (at least, not that I can find (http://discussions.apple.com/thread.jspa?messageID=10775374&tstart=0)). Odd... might be able to do something with sieve, but.. 

> 
> See the FAQ at <http://wiki.list.org/x/TIA9> for more on umbrella lists
> and workarounds including how to use regular_include_lists to make a
> 'better' umbrella list if you're not concerned about digest members of
> the sub-lists or processing bounces of posts sent to the "everyone"
> list.

I'm giving this a shot. For testing at least, I've just checked "no mail" for the child lists, and added them to the regular_include_lists, and we'll see what happens. 

Thanks very much! 

-Ryan Stasel

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