title: can't send email to addresses at my own domain
body: <p>I have a simple php script on my domain that sends me an email:</p>
  
  <pre><code>...
  $toMail = "me@gmail.com"; //this works - I get the email at my gmail
  $toMail = "me@mydomain.com"; //this doesn't - I get nothing
  
  mail($toMail, $subject, $message, $header); 
  </code></pre>
  
  <p>What setting to I change to fix this?</p>