protected function makeMailtoString($user, $domain, $subject = '')
 {
     $target = 'mailto:' . $user . '@' . $domain;
     if ($subject) {
         $target .= '?subject=' . Convert::raw2mailto($subject);
     }
     $target = str_replace(".", "&x2e;", $target);
     $target = str_replace("@", "&x40;", $target);
     return $target;
 }