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= ValidatesEmailWithSmtp Email validation using SMTP. ValidatesEmailWithSmtp provides a method to validate email address field against the mail server, which would receive the mail in case you wanted to send one. The original idea was shamelessly ripped from Webdigi blog entry <em>How to check if an email address exists without sending an email?</em>. <http://www.webdigi.co.uk/blog/2009/how-to-check-if-an-email-address-exists-without-sending-an-email/> Validation actually almost sends mail. It finds out the mail server for the domain part of validated address, connects to server and proceeds to sending mail up untill it finds out what the server has to say about the recipient address. Then it quits the connection.