Response by e-mail

I confess I have never tried the e-mail route to read and answer forum questions.  So I am wondering what happens if a response is made, the person gets it by e-mail. and then the person making the response goes back in an edits their answer.  Does the person get just the original response, or do they now get another e-mail with the edited version?

This can make a huge difference as sometimes the response is altered due to the "oh crap, I read the OP message wrong" syndrome, or the "oh crap, why did I say that" syndrome.