that best way to validate email would properly be to send an email out, if they don't click a link in that email you boot them back.
alternativly you could run a regular expression to check the emails validity.
isValidE = True
set regEx = New RegExp
regEx.IgnoreCase = False
regEx.Pattern = "^[a-zA-Z][\w\.-]*[a-zA-Z0-9]@[a-zA-Z0-9][\w\.-]*[a-zA-Z0-9]\.[a-zA-Z][a-zA-Z\.]*[a-zA-Z]$"
isValidE = regEx.Test(myEmail)