[Mailman-Users] How can I auto-reply to non-subscriber postings (and not have to go to the administration page)?

I am the administrator of a Mailman list, and would like to have the system auto-reply to non-subscriber postings, rather than my having to go to the administrative page. Otherwise, each piece of spam to the list wastes a significant amount of my time. I read all the documentation I could find, and none of the auto-reply features seem to do what I want (unless auto-reply with discard to -request would do it? ... it doesn't seem to though).

Thanks!

Geoff Clemm