How do I restrict users receiving email?

[ProjectDIBS]

Hello all,

I'm creating a special usergroup for students and I need to prevent them from receiving emails from other members. I do not see anything at the usergroup level to prevent this (which would be ideal).

I see for an individual user I can set their option to receive emails to "no", but then I can logon as a student, go into my control panel and turn that option back on. How do I prevent a student from doing that?

Ideally I'd like to restrict just that option, but if I can't do that, can I prevent the student/user from using the control panel?

Brian