See Generating daily digests on how to trigger daily digests via e-mail. See Generating digests after a certain time, number, or amount of messages on how to generate digests directly, dependent on a number of criteria. You can point several lists to the same moderator db, thus using the same moderators for several lists. Some of these setups are not trivial. 17.4 Lists that allow remote admin, but not user initiated subscription or archive retrieval.
Posts work as usual.
17.5 Lists that allow remote admin, user archive retrieval, but not user-initiated subscription. It is assumed that the users know archive retrieval commands without help. 17.6 Lists that restrict archive retrieval to subscribers. Only subscribers can receive archive excerpts. Digests work as usual.