title: Change mailed-by header in PHP mail
body: <p>I've configured several headers in the <code>mail()</code> function, sender name and other fields appear as set. But, in the gmail <code>mailed-by</code> field, I see the hostname of my server, even though I've set the Mailed-By header to be different... Is there a way to change this, or am I specifying the wrong header to effect the change?</p>
  
  <p>Current Headers:</p>
  
  <pre>
  From: no-reply@example.com
  Mailed-By: Example.com
  X-Mailer: Example/1.0
  </pre>