> Is there a way to require listowner approval
> for unsubscribing?  We know we can require
> owner approval for subscribing but We have
> lists for lab consultants we want to
> make sure they stay on.

You can make it more difficult for them to unsubscribe or set NOMAIL
by subscribing them under a variant of their email address different
from the one their email normally comes from.  Of course, people
using POP and IMAP clients can change the From address used.

Making them read and understand the messages is, of course,
another matter.