This[0] is a pretty extensive resource.

[0]: https://dismail.de/serverlist.html

I use Gmail for personal email, Zoho for business email. In the future I will be purchasing server hardware for the website and stuff. At that point I'll probably be moving to self-hosted email using something like Mail-in-a-Box.

https://mailinabox.email/

Haven't tried myself but if you're willing to pay for your privacy (you not being the product), hey.com seems promising (https://www.hey.com)