People responsible for the management and configuration of the mailing list. Owners also receive the errors and administrative notifications for the list.
Quiet Owners maintain the same rights as the Primary Owner. They will not receive the errors and administrative notifications.
Editors and owners are the only persons allowed to post to the list. They will choose when to send a post to others on the list.
Moderators receive postings from non-editors and approve them for distribution to the list.
People that receive postings, whether they've joined or got added to the mailing list.