In my humble opinion, unless you use your account only to receive emails but also to send them, your provider has limited effect on your privacy. That’s why I personally don’t have a use for Tuta, Proton and other similar, super private services (mind you, I’m not saying they aren’t good). That said, I’ve been a happy customer of mailbox.org for quite a few years and I found them reliable and cheap (if you don’t need a custom domain). Same for Posteo, I guess. At the moment, I’m a paying customer for Zoho email, with quite a few custom domains abd I’m fairly happy. They have a free tier as well and their privacy policy looks good to me.