The receiver now has the message and can delete it, forward it, copy it, etc. The sender may also keep a copy. Both the sender and receiver can do what they wan

The receiver now has the message and can delete it, forward it, copy it, etc. The sender may also keep a copy. Both the sender and receiver can do what they want with their copies. (This ignores copyright. I don't like copyright, but with copyright laws, presumably the sender would be the copyright holder, I should think?)