Many websites that support user accounts require users to enter an email address as part of the registration process. This email address is then used as the primary communication channel with the user. For instance, if the user forgets her password a new one can be generated and emailed to the address on file. But what if, when registering, a user enters an incorrect email address? Perhaps the user meant to enter me@example.com, but accidentally transposed the first two letters, entering em@example.com. How can such typos be prevented?
Read more at http://www.4guysfromrolla.com/articles/060910-1.aspx
Cheers,
Samitha
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