I use fastmail, and I enjoy it a lot. Their masked email is very nice as well, and integrates with bitwarden. So quite convenient to use my personal domain for stuff where my identity matters, and use masked @fastmail addresses for more disposable stuff.

The only thing that ticks me a tiny bit is that their mobile app doesn’t have offline mode; but you can use imap client or w/e, so it’s not too much of an issue.

Also hear good things about protonmail; I would consider it if I didn’t already use/trust fastmail.