It looks like a message specific issue. The user sent the message twice. Both times it fell into a back hole. He sent it to a co-owner. The co-owner posted it successfully. The problematic poster posted other messages successfully the day before the problematic period and later the same day. He posts several times a day almost every day.
It is a two time issue. He has had no difficulty posting either before or after the problematic two post attempts.
Thanks for responding. It would be easy to chalk this up as a mystery of store and forward and trundle on, but I am baffled.
I am considering asking him to try to post the message one more time, but the group has moved on and I would not like to confuse the group with a weird repost.
I am not very familiar with Apple email. Do they perform aggressive filtering that could account for this? I soured on Apple way back in the 80s, probably irrationally, and I have avoided them since.
Best, Marv
Marvin Waschke