Hint: To start the AJAX based asynchronous verification enter a valid or invalid email address into the E-Mail field and leave this field.
You do not have to press the button! The entered eMail address will be checked for a valid domain name using a DNS request that is executed on the server.
DNS lookups are not really fast so it can take a second before the verification asnwer is shown when the host in unknown on the internet.
This page is part of the http://www.mathertel.de/AJAXEngine/default.aspx project. For updates and discussions see The AJAX Engine blog.
