Your forms action is set to post to the ThankYou.asp page:
<form id="form" name="form" action="ThankYou.asp" method="post">
Unless the Universal Email server behavior is applied to that page, the email will never chance to be sent.
Change the action to be blank:
<form id="form" name="form" action="" method="post">
so that it will post to itself to give Universal Email the chance to send the email. In the Universal Email server behavior, you can set it to redirect to the ThankYou.asp page after the email is sent.