Did you enter a valid TO address when checking out?
The issue with not going to the confirm page was that the checkout page was missing the jquery js files... I added them back on lines 104-105:
<script src="//ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
<script src="//ajax.googleapis.com/ajax/libs/jqueryui/1/jquery-ui.min.js"></script>
In my test the email came through to me, so I'm not sure what the issue was there.