[Z_I_F_F]

Fastmail makes an excellent email client, but there are significant privacy concerns that have not been adequately addressed in many people's eyes.

Namely, that Australia (where Fastmail is based) passed laws that require all Australian companies to give any/all data on their users to the Australian government, and are not allowed to publicly disclose what is given.

Not that Google is any better.

If you want a privacy-focused email that "just works" consider Protonmail or Tutanota. Alternatively, if you're feeling bold, you can self-host your own email like I do, but I wouldn't recommend it unless you're in it for the fun of it!