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Eliminate duplicates from multiple lists

1996-08-29 09:26:35
For system administrators and site managers... 

What is the best way to PREVENT duplicate messages to users (as supposed to 
filtering message-IDs from their mailboxes) when the user is contained on 
multiple lists specified in the To or CC line? For example, if a message is
directed as such:

        To: list-a, list-b
        CC: user-1

and the dist files for list-a and list-b includes user-1. In this scenario,
user-1 will receive 3 messages in their mailbox. This is not acceptable.

Some points:
        
        o The site maintains list-a and list-b

        o We are asking for a prevention, since filtering is not option if 
          user-1 is an external user (outside the domain/site) and has no
          local mailbox.

Vanilla Sendmail can handle this without any problem; but we would like to
continue using Procmail/Smartlist because of the numerous features they offer,
but this problem might just make us revert back due to user pressures.

Thank you in advance for any assistance and suggestions
John Delgado                        The Open Group / Research Institute
jdelgado(_at_)osf(_dot_)org                    Eleven Cambridge Center 
(617)621-8779                       Cambridge, MA 02142 - USA
http://www.opengroup.org 

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