[Mailman-Users] disable unsub from a list?

[Dave Robbins]

Thanks for the info about preventing non-members from posting.  I got it.

Because I currently have sendmail lists where users cannot unsubscribe
(and are not allowed to), is there any mechanism for disabling a
members's ability to do this?   For example, a list to deliver
emergency notices would not work too well if members were permitted 
to unsubscribe.  At the same time, however, I desire the no-posting
from non-members.   Thanks.

Dave Robbins