Right, well in concept that feature is silly. It would be like paying USPS to remove some letter from a physical mailbox. At some point you need to commit to the message.

Regardless what I'm really saying is that it's all probably smoke and mirrors on the client server (plus client UI). The server is probably configured to keep all messages anyway, and it gets "tombstoned" and not sent by the middle tier server. I don't know of course, but I was talking about how users are not really in control as they think they are.