Hello!
My idea is as follows:
when a game is over, usually the one who resigns sends a message to the opponent, thanking (usually 🙂 ) him for the game. Me, as a winner, I'd like to send him back wishes, but i'd like to do that without sending a new message to the opponent (and filling out the subject, body, and so on), but as replying to the message received.
Thanks
Daniel