title: Php mail() - Priority types
body: <p>want to know what are the php mail() priority types. I read this <a href="https://stackoverflow.com/questions/4169605/php-mail-how-to-set-priority">question</a> and I read the php manual,</p>
  
  <pre><code>&lt;?php
      $headers = "MIME-Version: 1.0\n" ;
      $headers .= "Content-Type: text/html; charset=\"iso-8859-1\"\n";
      $headers .= "X-Priority: 1 (Higuest)\n";
      $headers .= "X-MSMail-Priority: High\n";
      $headers .= "Importance: High\n";
      $status   = mail($to, $subject, $message,$headers);
  ?&gt; 
  </code></pre>
  
  <p>but its not explain what are the types we can used. <code>X-Priority: 1 (Higuest)</code> and <code>X-MSMail-Priority: High</code> two different words used for this. there are few types of priority I found. ex: Low, Medium, High, Urgent, Emergency, Critical how we used this types. </p>