That’s not really true, S/MIME is a thing

That’s true of protonmail too

Immigrants who have left the USA vote in the last state they were registered in.

That can easily be achieved with dovecot and a sieve script.

Might not be snake oil, but that shit is bad for you. If it came out today it wouldn’t be sold OTC.

SSL certs is so easy with let’s encrypt, that really shouldn’t be a blocker.

If you want something easy I think you have your answer with Signal