I want to follow up again, about one thing here.
When a non-member sends a message to a group where only members can post, the return message says:
Message not delivered
Your message couldn't be delivered to
GroupName@groups.io because the remote server is
misconfigured. See technical details below for more
How is that helpful?
If you scroll down and read the fine print at the bottom, there it does say you are not subscribed. But why does something (Google?) insert that other, large, unhelpful message? Can anything be done to eliminate the "misconfigured" part?
(This was from messages posted via email, from Gmail.)