$rcmail_config['virtuser_query'] = array('email' => '', 'user' => '', 'host' => '');
$rcmail_config['virtuser_query'] = 'SELECT password FROM postfixadmin.mailbox WHERE username = %u AND active = 1';
$rcmail_config['virtuser_query'] = array( 'email' => 'SELECT password FROM postfixadmin.mailbox WHERE username = %u AND active = 1', 'user' => '', 'host' => '');