[Orb] Orb list digests

FYI for digest subscribers - I sent the following to the owner of the mailing list: "The Orb digest seems to be on the fritz. It is sending out digests every hour or two, instead of daily. Getting a digest with 2 or 3 messages isn't much better than receiving every single e-mail. Can you fix it so that it really is a daily digest again?" Hopefully someone is still minding the store.