What is a Mailing List?
Some lists are moderated. This means that each message is reviewed by a
human to ensure that it is appropriate and in keeping with the purposes of the list before
it is redistributed to the list's subscribers.
Some lists are restricted - subscriptions to the list are not available to the public.
Still other lists are completely open: they are unmoderated, open to anyone, and a
person does not have to subscribe in order to send messages to the list.