public function getFilePath(User $receiver)
    {
        $basePath = $this->getOption(self::CONFIG_FILEPATH);
        if (is_null($basePath) || !file_exists($basePath)) {
            throw new \common_exception_InconsistentData('Missing path '.self::CONFIG_FILEPATH.' for '.__CLASS__);
        }
        $path = $basePath.\tao_helpers_File::getSafeFileName($receiver->getIdentifier()).DIRECTORY_SEPARATOR;
        if (!file_exists($path)) {
            mkdir($path);
        }
        return  $path.\tao_helpers_File::getSafeFileName('message.html', $path);
    }