thanks! i thought about server version, but decided to keep it fully local for now.
it has ssh-like mechanism of public key + signature generation on first contact, so just mimicking the badge or adding random signature won't work – recepient will see it's not verified signature.
i hate getting emails almost fully copy-pasted from LLMs. you cannot do much with it though. but i thought what you can do - is to show your message is real.
so I made this extension called Typed.
it shows how much of the email text you typed and adds a signed proof when you click send.
it's not perfect, i know: you can always write anti-extension to imitate typing or find other hacky way.
but I was using it for a while myself and liked the feeling of a sent email with a signature showing how much of the text was typed.
it has ssh-like mechanism of public key + signature generation on first contact, so just mimicking the badge or adding random signature won't work – recepient will see it's not verified signature.