Mark Sapiro writes:
Mailman 2.1 had a regular_include_lists feature that would allow specifying another list whose members would receive posts to this list. I think that is what you are looking for. Unfortunately, that feature has not yet been implemented in Mailman 3.
Implementing regular_include_lists is the "right" way to do this, but it may take a while.
If your "inner" users are somewhat sophisticated, you could have *two* inner-lists, one with address "inner-list-members@your.domain" which the inner-list members sign up for but is not advertised, and has no decorations such as subject tag and footer. The other would be named "inner-list@your.domain", would have "inner-list-members" as its only subscriber, and it would be the advertised posting address and provide the decorations. Complete the hack by subscribing "inner-list-members" to "outer-list".
You can make "inner-list" a "by-list-owner-only" subscription policy, and have a description directing users to sign up "inner-list-members" instead.
Not optimal, but it's a one-time annoyance for each subscriber and the list traffic looks the way I think you want it (decorations for posts to the outer list are outer-list for everybody including inner-list members, decorations for posts to the inner list are inner-list).
You could also do this with all posts going to inner-list getting inner-list decorations, by requiring that outer-list subscribers subscribe to outer-list-members, which provides the outer-list decorations (I think this can be done but it will be confusing to list admins). Then "outer-list" would have no decorations and the sublists as the only subscribers. "inner-list" would have its own decorations.
-- GNU Mailman consultant (installation, migration, customization) Sirius Open Source https://www.siriusopensource.com/ Software systems consulting in Europe, North America, and Japan