How to Test if an Email Address Exists?

So we have all been doing email address validation for awhile which I know how to do, but validation only tests if an email address is entered in the right format.  It doesn't verify if an email address actually exists.  I am creating an application  where there will be membership fees, and so an email has to be in more than the right format, I must be positive that it actually exists when the account is created before any money changes hands.  This is critical.  Unfortunately, all of my searching for this relating to Flex or Flash Builder has yielded no results.  Does anyone know of any tutorials or blogs or articles that discuss how to test if an email address entered by a user actually exists using Flex?  or does anyone here have any suggestions on how to approach this problem?
Thanks!

The only definitive way is to send the user an e-mail, and have them verify the email address.
In the past I remember researching options.  Depending on how mail servers were set up; I thought there was some way to ping a mail server and ask if the e-mail address was valid.  This functionality was turned off on most mail servers to prevent spammers from harvesting email addresses.
Here are some good info on the general approach:
http://stackoverflow.com/questions/565504/how-to-check-if-an-email-address-exists-without- sending-an-email

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