How to Create Announcement or "Read-Only" Lists in Mailman
Max Fowler

Last modified: December 31 1969 16:00:00 Add OWNERS_CAN_ENABLE_PERSONALIZATION = 1 to /etc/mailman/ You only have to do that once. When you create the new list, under the List Characteristics section, set the first option ("Should new members be quarantined...") to Yes.