One of the owners of one of the groups I help moderate sent an email to the group twice. In both cases, the email did not appear on the groups.io site and was not reflected to the membership. The sender is not a technologist, but he is an experienced computer user and he posts to the group successfully several times a day. He received no undeliverable mail message. He's checked his spam folder for error messages. He forwarded the message to me and to one of the other co-owners, who then successfully sent the message to the group.
I've gone through the activity log and find no evidence that the email ever made it to groups.io.
I've examined the message he forwarded to me and I can't see anything exceptional about it.The only things notable are it is long (8846 characters) but not excessively long. Most of it was pasted into the email. HTML for the paste shows fairly elaborate formatting. It was sent from a me.com address, through Apple Mail, I think.
I baffled. What am I missing? Has anyone experienced anything similar?
Best, Marv
Marvin Waschke