Maybe I'm up against a known bug that has been describe here before, although I can't find it.
If somebody sends me an e-mail, I hit reply, enter a response. I then click on the menu key, or click on the jog dial, and a menu comes up with different options, like "save draft", "delete original text", etc. But, no "send" option comes up. However, I compose a new e-mail, and hit the same buttons, "Send" is always one of the options.