Form to mail

I suspect a lot of static sites want a single dynamic feature: submitting a form to an E-mail address.

I dove into building a service to make that easy, only to realize that it would be a lot easier and elegant to add it directly to my free static hosting platform, xmit.co.

Here is today's design; I welcome feedback and suggestions.

In my site's HTML, I can add a form like:

<form action="/contact" method="POST" enctype="multipart/form-data">
  <input type="text" name="name" placeholder="Name" required />
  <input type="email" placeholder="E-mail" name="email" required />
  <input type="subject" placeholder="Subject (optional)" name="subject" />
  <textarea name="message" placeholder="Message" required></textarea>
  <select name="domain">
    <option value="personal">personal</option>
    <option value="work">work</option>
    <option value="hobby">hobby</option>
  </select>
  <input type="file" name="files" multiple />
  <button type="submit">Send</button>
</form>

for this (now working) example:

To activate it, I add to my site's xmit.toml:

[[forms]]
from = "/contact"
to = "pc@rrier.fr"
then = "/posts/form2mail/"

I can then receive an E-mail like:

From: "John Doe" <john.doe.gmail.com@forms.xmit.co>
Reply-To: "John Doe" <john.doe@gmail.com>
Subject: [nothing.pcarrier.com] Hello

---
domain = 'personal'
---

How are you?

enctype is only required for file uploads, and all fields are optional. If I POST nothing (curl -d '' https://nothing.pcarrier.com/contact), I receive:

From: "nothing.pcarrier.com" <noreply@forms.xmit.co>
Reply-To: "nothing.pcarrier.com" <noreply@forms.xmit.co>
Subject: [nothing.pcarrier.com] Form submission

then is a URL to redirect to after the form is submitted. When absent, we serve whatever resource is at the requested URL.

I can't quite think of anything important missing in this design; can you? Are there other such small features you'd like to receive from your static hosting provider? I appreciate all feedback!