PersonToEmailAddress Common
From Paterva Wiki
This transforms uses the techniques used in the EmailAddressToEmailAddress Verify transform. Since this gives us the ability to verify if an email address exists we can expand the idea to test for combinations of firstname / lastname on popular email providers - like Gmail and Hotmail. The providers (domains) where the transform test is configurable - e.g. you can add/remove domains be changing the 'Domains to check' additional transform setting. There is one difficulty here - not all mail servers falls for the verification trick. As such you cannot randomly add domains here - be sure to test if email addresses can be verified using the verification transform first.