[Mailman-Users] auto-rejection for closed mailinglists

[C:SAR Computers]

Is there a way to make a *closed* mailinglist with mailman?

When I set my emailaddress in "posters";
set "Restrict posting privilege to list members? (member_posting_only)" =
to NO and
set "Must posts be approved by an administrator?" to NO,

I don't get anymore messages from members, having posted to the list and =
awaiting approval, but those messages are still there (waiting for =
approval, or rejection). Is there a way to make mailman auto-reject all =
messages to the list (when sent from other emailadresses than listed in =
"posters")?

Please help me out here...

Regards,

Kevin Pronk