Have you checked to see if the only person's messages you receive is:
A subscriber who is sending messages to groupname+owner at groups.io
or?
A non-subscriber who is sending messages to groupname+owner at groups.io
Either one would be received by you but not sent to others except Moderators unless appropriate box checked by the sender.
Also, the message would not show up in your archive in the above cases.
Also, when you reply to those singular messages do you use the reply button on the message or reply at the group or how do you reply.
Some or none of this may help diagnose the issue.
--
Bob Bellizzi
