> dynamic "secret" key fetching from some backend via JS that gets injected into the form and works as a "password" to successfully trigger the email to get sent
Are you describing nonces? A nonce is basically a "secret" (due to SSL encryption) number inserted into the HTML and submitted via a form. You don't need JS, just SSL.
Are you describing nonces? A nonce is basically a "secret" (due to SSL encryption) number inserted into the HTML and submitted via a form. You don't need JS, just SSL.