How do I make mlist visible only to admins?

[mysimplesite]

Is there some code I could add somewhere which would allow only admins to view mlist?

Right now if someone types in abc???.com/mlist they can view the members list. I want to make mlist viewable only to admins and have some sort of statement saying 'You don't have permission to view this file" or something like that.

[Sir Osis of Liver]

That link throws a 404, unless you're running a mod that adds it.

If you're referring to /index.php?action=mlist, you can block that by unchecking 'View the memberlist and groups' in permissions.