If you've looked at the Mailman FAQ at http://www.python.org/cgi-bin/faqw-mm.py?req=show&file=faq03.011.htp
, you may have noticed you don't have direct access to what they mention. You can, however, setup such a list using the Admin Panel in Mailman.
1. Delete the following text from the General list information page by editing it in your Mailman Admin panel. It's under Other Administrative Activities - Edit public HTML pages
"To post a message to all the list members, send email to
2. Under General Options, either turn off the Welcome message and subscribe people manually or add to the welcome message a note that you do not accept posts to the list. Also, turn off include the List-Post: header (at the bottom).
3. Under Privacy Options, Sender Filters, moderate new member postings to yes, reject posts, rejection notice should say something like "Sorry, you cannot post to this list.", Discard or reject posts from non-members, and don't forward their posts to the moderator.
4. Under Membership Management, Additional Members Tasks, Set everyone's moderation bit, including those members not currently visible to ON and click on Set button. Then go through the membership list there and unset the bit for anyone who is allowed to post such as yourself.
I think that should do it.