(no-comment): This must be unique and contain no data.
(personal-comment): Ditto.
(request-confirmation): Ditto.
(read-confirm): This must contain no data.
(redirect): Clear inherit, secret and hide-creator.
(mx-author): Clear inherit, secret, hide-creator and dont-garb.
(mx-from): Ditto.
(mx-reply-to): Ditto.
(mx-message-id): Ditto.
(mx-in-reply-to): Ditto.
(mx-misc): Ditto.
(mx-allow-filter): Ditto.
(mx-reject-forward): Ditto.
(mx-to): Clear inherit and dont-garb.
(mx-cc): Ditto.
(canonical-name): Ditto.
(mx-date): Clear hide-creator, secret and dont-garb.
(notify-comments): Clear inherit, hide-creator and dont-garb.
(recommended-conf): Clear inherit and dont-garb.
(allowed-content-type): Clear inherit and dont-garb.  Require a
	priority number before the content type, and don't allow more
	than one "/" or " ".
(mx-list-name): Set owner-delete.  Clear dont-garb and inherit.
(mx-refuse-import): Set unique.  Clear dont-garb and inherit.
(mx-mime-misc): Set unique.
(mx-envelope-sender): Set unique.