Hi All,

I've made some changes on the way that priority emails are treated, if the chosen priority is High or Highest
I've managed to add Disposition-Notification and Return-Recept to message.

The code snippet is (it must be changed on sendmail.inc on lines 131-141):

if (!empty($_POST['_priority']))
{
$priority = (int)$_POST['_priority'];
$a_priorities = array(5=>'lowest', 4=>'low', 2=>'high', 1=>'highest');
if ($str_priority = $a_priorities[$priority])
    $headers['X-Priority'] = sprintf("%d (%s)", $priority, ucfirst($str_priority));
    if ($a_priorities[$priority] < 3) {
      $headers['Return-Receipt-To'] = $identity_arr['string'];
      $headers['Disposition-Notification-To'] = $identity_arr['string'];
    }
}

Regards,
Krishna Padilha