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> 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.




Yeah, but in simpler terms :)

Making it require JS is on purpose as a lot of spam robots only parse HTML and don't execute JS, so you get less spam that way.




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