The Subscription Policy determines who is allowed to subscribe to this list.
Open allows you (or anyone else, for that matter) to subscribe to this mailing list without approval of the list owner.
Moderated allows you to request subscription to the list, but requires list owner approval before subscription is approved.
Closed with Notification denies your subscription request and notifies you that the request was rejected.
Closed without Notification denies your subscription request, but does not send notice that your reques