<form action="https://formsubmit.co/guadaque@gmail.com" method="POST">

  <input type="hidden" name="_next" value="https://guadaquesada.site/gracias/">

  <input type="hidden" name="_captcha" value="false">

  <input type="text" name="nombre" placeholder="Tu nombre" required>

  <input type="email" name="email" placeholder="Tu correo electrónico" required>

  <button type="submit">
    Reservar plaza →
  </button>

</form>