Save the following file (also attached to this page) to horde/lib/Auth/cpanel.php:

::

 <?php
 
 require_once dirname(__FILE__) . '/imap.php';
 
 class Auth_cpanel extends Auth_imap {
 
     /**
      * Constructs a new cpanel authentication object.
      *
      * @param array $params  A hash containing connection parameters.
      */
     function Auth_cpanel($params = array())
     {
         $this->capabilities['transparent'] = true;
         parent::Auth_imap($params);
     }
 
     /**
      * Automatic authentication.
      *
      * @return boolean  Whether or not the client is allowed.
      */
     function transparent()
     {
         if ($this->_authenticate(getenv('REMOTE_USER'),
                                  array('password' => getenv('REMOTE_PASSWORD')))) {
             $this->setAuth(getenv('REMOTE_USER'),
                            array('transparent' => 1,
                                  'password' => getenv('REMOTE_PASSWORD')));
             return true;
         } else {
             return false;
         }
     }
 
 }

Then add the following line to horde/config/conf.php *after* the line saying /* CONFIG END. DO NOT CHANGE ANYTHING IN OR BEFORE THIS LINE. */:

::

 $conf['auth']['driver'] = 'cpanel';

Don't change anything else in the conf.php file.