If you're a paid iCloud user or an MS365 user, both have ways to use a custom domain and tap into the storage you're already paying for at no extra cost. MS365 locks you in to GoDaddy as a registrar and I'm on Cloudflare, so I use iCloud. I'm not sure what your threat model is, so you may not be willing to consider either of these options. For me, email privacy is an oxymoron and I prefer communication methods with forward secrecy like Signal. For email, I'm mainly just looking for a vanity domain I can share with my wife for spam and mailing lists.<p>Growing past the above suggestions, at the cheap tier, I'd recommend Migadu, MXRoute, or Zoho.<p>If you're willing to pay what I consider to be Too Much For Email, then my favorites are Proton Mail, StartMail, or Fastmail. You'll want to research these heavily before transitioning though, as they may be missing features you're used to from Gmail that you find you can't live without.