Set up
Sign up, name the form, give the email to notify. You get a submit URL and snippets. Or let an agent do it with POST /v1/quickstart.
<form action="https://postbag.dev/s/fm_8f3kq2" method="POST">
<label>Email<input type="email" name="email" required /></label>
<label>Message<textarea name="message" required></textarea></label>
<input type="text" name="_gotcha" tabindex="-1" autocomplete="off" style="position:absolute;left:-10000px" aria-hidden="true" />
<input type="hidden" name="_redirect" value="https://example.com/thanks" />
<button type="submit">Send</button>
</form><form action="https://postbag.dev/s/fm_8f3kq2" method="POST"> <label>Email<input type="email" name="email" required /></label> <label>Message<textarea name="message" required></textarea></label> <input type="text" name="_gotcha" tabindex="-1" autocomplete="off" style="position:absolute;left:-10000px" aria-hidden="true" /> <input type="hidden" name="_redirect" value="https://example.com/thanks" /> <button type="submit">Send</button> </form>
What you get
An email per submission with Reply-To set to the sender, so you answer from your mail client. An inbox in the dashboard with every message, including the ones the honeypot caught. A 303 back to your thank-you page for plain HTML, JSON for fetch. Nothing to maintain.
When it grows
Add Telegram for the phone. Add a webhook into your CRM. Put an origin allowlist on the form so only your site can post. Turn on Turnstile if the honeypot is not enough. None of this requires touching the HTML.