Sorry, another email!
I can't choose 1 or 2. I am not sure that your fix works for me and it is clear that some groups are having members cut off.
Interestingly, I am seeing that only occasionally in our travel group of over 1100 members. It doesn't happen at all in my small groups.
Would changing someone to "no mail" mean that my group preferences are changed to allow "no mail"?
Frances