Sometimes people might want to send a hit-and-run message, where they knowingly don't want to receive a reply. I don't think we want to remove that option. It's been done to me. Seems kind of odd, but hey, user choice.
But the software could at least issue a warning message, letting the sender know that their replies are disabled. That way, if it's what they want, they could leave it disabled. Or if it's not what they want, it prompts them as a reminder to turn it back on.
(This post was edited by Boogers on Apr 17, 2014, 10:42 AM)