private static function mail()
    {
        $files = ['Mail', 'Mailable', 'SMTP'];
        $folder = static::$root.'Mailing'.'/';

        self::call($files, $folder);

        $files = ['SmtpParameterNotFoundException', 'MailViewNotFoundException'];
        $folder = $folder.'Exceptions/';

        self::call($files, $folder);
    }