The messages in question involve people who are using their online Yahoo mail inboxes, not the groups.io website messages page.?
The group message received in their Yahoo inbox has a return address of the person who posted the original message to the group, instead of the group.io address.
The members replying to the message in their Yahoo inbox see the subject line is "Re: the group topic" and don't notice that the To: line is a private email address instead of the group's address. Then if the person receiving that reply responds back, that response goes to the other members' Yahoo address, and now the circle is established between the two unsuspecting members, chatting or arguing back and forth unaware that they are communicating directly rather than through the group. LOL
But anyway, we'll change the Admin settings and see if that fixes it.
Thanks!
-Daniel
