I've been trying to configure mailman to reject non-member posts to
wikiis-l, I've succeeded in making it reject any non-member posts and
send the poster a message saying that hir mail has been moderated,
however what I've not been able to configure is the message sent in
this email, currently it is:
"""
You are not allowed to post to this mailing list, and your message has
been automatically rejected. If you think that your messages are
being rejected in error, contact the mailing list owner at
wikiis-l-owner(a)wikimedia.org.
"""
I set member_moderation_notice in
http://mail.wikipedia.org/mailman/admin/wikiis-l/privacy/sender to
something entirely different, without success.