Digests work as usual. 17.7 Lists that do not allow archive retrieval at all. No archive retrieval commands will be honored. 17.8 Lists that do not allow archive retrieval and do not allow digest triggering per mail. 17.9 Lists that allow archive retrieval only to moderators, but allow user-initiated subscription.
Digests are unaffected.
Alone, this is very insecure. Posts from other e-mail addresses are rejected. 17.12 Announcement lists allowing moderated posts from anyone. This is useful in many circumstances. A list announcing new programs for a system, where both the main developers and other users may have contributed programs.