[Mailman-Users] Efficient handling of cross-posting

[Mikhail T.]

Hello!

Our site uses mailman to host many mailing lists. Sometimes a person would 
find it necessary to post to several of the lists at once incurring 
irritation of the subscribers for the following reasons:

 1. People subscribed to more than one list will get the same message
    multiple times.
 2. The same message will be stored in multiple archives increasing their
    size.
 3. The same message will come up multiple times in subsequent searches
    through the archives.

Can our mailman installation be tweaked to eliminate all or some of the above 
undesirable effects? Thanks,

 -mi