Richard,
But it seems like Groups.io should send a reply to ALL when REPLY TO
GROUP is enabled.
The Reply To option for the group can be set to either "Group" or "Group and Sender". In either case Groups.io puts the correct thing in the "Reply-To" header field of outbound messages: just the group posting address for "Group", or both the group posting address and the posting member's address for "Group and Sender".
The issue, for some members, is whether their email interface obeys the header field (which is a standard header field, and so ought to be used), and/or whether its default behavior is to reply solely to the sending address or to sender plus all recipient addresses.
Shal
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