...
The first issue can be hardest to deal with. You don't want to open the umbrella list to posting from anyone because you have already arranged for any posts from the umbrella to pass through to the sublists. You want to add the sublists to accept_these_nonmembers of the umbrella, and in Mailman 2.1.10 and newer, you do exactly that using the @Listname syntax (For more information see the "Details for accept_these_nonmembers" link from the Privacy options... -> Sender filters page in the web list admin interface).
| Note |
|---|
For cPanel mailman Mailman the entry in accept_these_nonmembers uses the cPanel list name, i.e. an entry of the form @list_example.com. |
...