[Mailman-Users] How to disable -admin?

[Joerg Stenger]

I want to set up an announcement list and the mail 
sent from the admin's of the list should have only "listname at my.dom"
in the "From:" line.

Q1: how do I prevent anyone but the admin's from posting?
Q2: how do prevent "listname-admin at my.dom" as sender?

Thanks in advance,
Joerg Stenger

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