e-newsletter restrict subscriptions.

Hi

Please, please, please could you tell me if there is any way to restrict the subscription options within the admin panel.

I have created several groups within e-newsletter but I do not want all of these available to each role.

ie, the newsletters are directed at parents, teachers and students. I do not want parents and students to be able to subscribe to the teacher newsletters.

How do I do this?

Thanks

Stef