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Virginia,

Our group's Reply To option is set to "Group and Sender" thinking that
would work the same as it did in Yahoo Groups, where clicking Reply
sends a response only to the Sender and Reply All goes to both the
sender and the group.

That's not what "Group and Sender" means. It means that Reply should go to both. I suspect that your Yahoo Group was actually set to "Sender".

That would cause the Reply-To field to have the sender's address.

The behavior of Reply-All is much more varied with various email interfaces, but it would customarily include all recipients of the message, so it would reply to both the sender (taken from the Reply-To field) and the group (taken from the To field).

In Groups.io setting the group's "Reply All" to "Sender" also might do what you want.

In Thunderbird it gives me two buttons: Reply (goes to sender) and Reply List (goes to group). If I go to the menu and pick Reply All it goes to both.

Shal


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