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Miles Fidelman wrote:
> Hi Folks,
>
> Someone just asked me if I could set up a group of 7 lists for them, 
> with an interesting property: the lists have overlapping membership, 
> and they'd like to set things up so that a message sent to multiple 
> lists doesn't show up multiple times, if someone is on more than one 
> of the lists. (Think sports teams - a parent has kids on more than one 
> team - an announcement about field use goes out to parents of kids on 
> 3 of the teams.)
>
> To be more concrete:
> - 7 lists, a-g
> - John is on lists a, c, e
> - a message is sent to lists a, b, c
> - is there a way to set things up so John only gets one copy, instead 
> of 2?
This is not the first time we receive a request for that feature. Until 
now we refused it because subscribers may have different subscription 
option on each list, also because some list may modify the message in 
different way (tagging the subject or adding a footer).

This feature suppose to manage a new RDBMS table 
(subscriber,message-id). This table may become big, so a garbage 
collector is requiered. It seems quite complex for a feature that should 
be implemented by the MUA, not by the mailing server.

(Note that there is no solution unless provided by the MUA if the 
message is sent to you and to a list you are subscribed to like. Exactly 
this message is).


Serge Aumont