title: Is it possible to use double @ in an email address?
body: <p>I know Yahoo and Gmail do not accept it. But I want to know if it's possible for a person to create an email address with double <code>@</code> in address and if they can receive emails with that address?</p>
  
  <p>For example: <code>info@stackoverflow.com@example.com</code>.</p>
  
  <p>I do not want to use this non standard format, but I want to know if a hacker can do it?</p>