Case: How to check quality of emails in your database (using KickBox.io)
What could be easier than check an email address? Obviously, at least two operations should be done. First, to check the syntax of each email address. This task isn’t trivial and not only because some users have been registered in localized domains (like .在线, .இந்தியா, or .қаз). Second task is to check if given email does exist at server.