Tuta (free): you can send only like 6 email per day. Otherwise, Tor-friendly. No onion. Support forum on Reddit 😞 Germany.
Posteo.de: 1 €/mo affordable. Nothing fancy. Support via PGP like that’s common sense. Germany. Non-crypto anonymous payments w/ various options (e.g. a prepaid CC): they don’t even ask your name (much less address, cell phone number).
Disroot.org: Free, pop/smtp, community-based, trusted even by the Tails team. w/ onion. Netherlands.
Cock.li: Free, pop/smtp etc. Very Tor-friendly w/ fast onion. It’s good if you think it like disposal. Irresponsible in a way (aka Freedom), but actually 10-year-old & stable. Romania.
Proton (free): bloated, very mixed opinions, yet better than Google. w/ onion (slow). Switzerland. A simple feature like Plain Text view is missing (HTML by default: not serious about privacy).