I have a couple of announcement groups where I send out messages from other organisations. I want replies to go directly to the other organisation, not to me as the sender. I do not want to have to forward dozens of messages that could have gone directly to them.
In Yahoo Groups, I could put a Reply-To: header in the message I sent, and when people replied, it would go to that address.
In Groups.io, the Reply-To: seems to be stripped out of the message members get.
This appears to be a bug which has been fixed. In announcement groups, a Reply-To: on an incoming message will now be carried over to the message being sent out to group members.
David