[Mailman-Users] Bouncing immediately unauthorised senders

Hi,

I have a number of lists that have a limited set of addresses that can send to it. Is there a way to bounce any other senders immediately, instead of queueing in the administrative requests?

Current settings:

moderated = NO member_posting_only = NO posters = ['a@xyz.com', 'b@xyz.com', 'z@abc.org' ]

mailman v2.0.13

Any ideas?

Thanks,

David Richards