public function load_config($fname = 'config.inc.php')
    {
        if (in_array($fname, $this->loaded_config)) {
            return true;
        }

        $this->loaded_config[] = $fname;

        $fpath = $this->home.'/'.$fname;
        $rcube = rcube::get_instance();

        if (($is_local = is_file($fpath)) && !$rcube->config->load_from_file($fpath)) {
            rcube::raise_error(array(
                'code' => 527, 'type' => 'php',
                'file' => __FILE__, 'line' => __LINE__,
                'message' => "Failed to load config from $fpath"), true, false);
            return false;
        }
        else if (!$is_local) {
            // Search plugin_name.inc.php file in any configured path
            return $rcube->config->load_from_file($this->ID . '.inc.php');
        }

        return true;
    }