I have to use Roundcube with http authentication, so I downloaded the http_authentication plugin, copied to the plugins directory, added the line : $rcmail_config['plugins'] = array(http_authentication); to the main.inc.php, but it doesn't work, simply shows the default login page when I try to open mydomain.xy/roundcube I'm beginner in roundcube, and I really don't know what to do, please help me!