[Mailman-Users] umbrella lists and avoiding duplicates

[Peter Schneider-Kamp]

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Hi!

Is there nowadays a good way of avoiding dupes, i.e., multiple posts of
the essentially same message to one list?

Also, I would like to have some umbrella lists. I have found an
old thread in the archives (from April 2001) which proposes
syncing the user lists of the umbrella list with the members
of the sub-lists.

Is this still state of the art or is there a better solution?

Kind regards,
Peter
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