title: PHP email Headers - delivery option
body: <p>I've added the following code to our PHP Mail app which sends out emails:</p>
  
  <pre><code>$email_header .= "Disposition-Notification-To: $from"; 
  $email_header .= "X-Confirm-Reading-To: $from"; 
  </code></pre>
  
  <p>However, we are not receiving any 'Delivered' or 'Read' confirmations.</p>
  
  <p>Any thoughts?</p>
  
  <p>Thanks,</p>
  
  <p>H.</p>