/**
  * @return void
  */
 protected static function set_conf_from_yaml()
 {
     $conf = (array) Config::inst()->get('SmtpMailer', 'conf');
     // die(print_r($conf,1));
     if (!empty($conf)) {
         self::$conf = self::array_merge_recursive_distinct(self::$conf, $conf);
     }
 }