For old codgers like me can you make a bigger difference between the Send and Back buttons? I know you can swap the positions, but neither position seems particularly intuitive. I keep thinking I've sent a message, then realise I must have hit the Back by mistake.
TBH I don't know why there's a Back button anyway. You'd normally rely on the browser's back button if you changed your mind about sending the message.
(Just noticed there's no Back button on a forum post!)