Set Digest Mode If you turn digest mode on, you'll get posts bundled together (usually one per day but possibly more on busy lists), instead of singly when they're sent. If digest mode is changed from on to off, you may receive one last digest.

Off On

However, I still get several "Digests" a day, recently. I am a little surprised at that. Other groups I am subscribed to do not do this.

If Mailman has a setting that determines when to send a digest, and it set really low, possibly to impress people like me that the group is a live and well and saying a lot of encouraging things, well ... it is working. But we may not need to have so many digests per day.

It gets hard to digest (smerk).