[Mailman-Users] Stop monthly password reminders?

Hi all,

Quick question: I've looked through most of the options available to a list admin, and I can't find one to disable the monthly password reminders. I know this sounds like a bad idea, but we have a secretary who maintains quite a few mailing lists for out department, and we'd like to switch her over to mailman. However, we probably don't want students to be able to unsubscribe themselves from certain of our announcement-type mailing lists. Any ideas? Am I missing something simple?

Thanks much,

Josh Lothian System Administrator University of Tennessee, Department of Computer Science