public static function raw($to, $subject, $data, array $headers = [])
    {
        if (!is_array($to)) {
            $to = [$to];
        }

        $message = new Message();

        $message->toList($to)->subject($subject)->setMessage($data);

        foreach ($headers as $key => $value) {
            $message->addHeader($key, $value);
        }

        return static::$instance->send($message);
    }