title: wp_mail - not working when $headers are set
body: <p>In my files the wp_mail function does not send a mail if I set the optional $headers parameter. I just don't receive any mail when it's set. If I leave it away, however, the mail arrives.  </p>
  
  <pre><code>$headers = 'From: My Name &lt;myname@example.com&gt;' . "\r\n";
  wp_mail($to, $subjects, $message, $headers); // not working
  wp_mail($to, $subjects, $message ); // working
  </code></pre>
  
  <p>What could cause this?</p>