I am very very happy with Fastmail. I know they have some presence in the US but I think they scaled that down and are entirely an Australian company.

Their integration with 1password and masking email aliases is also very useful [0].

If however you want to host your own emails, I did once write an extensive guide [1].

[0] https://www.fastmail.com/features/masked-email/

[1] https://flurdy.com/docs/postfix/