Email replies: preventing multiple responses

When you've got a large team of people replying to customer email, there's a risk that two people will try to respond to the same message at the same time.

FogBugz prevents this in two ways:

1. As soon as you hit the Reply button, the case is assigned to you. That way other people can see that you're working on it.
2. If somebody else dashes in and sends a reply anyway, while you are in the process of composing your reply, when you click Send, FogBugz won't actually send the reply. It will warn you that somebody else has changed the case and let you decide whether you still want to send your reply or not.