Domain name with Namecheap, Gandi, $your_favorite_registrar. Mail provider with any small provider. Use Thunderbird, it's honestly better that it has been in

Domain name with Namecheap, Gandi, $your_favorite_registrar. Mail provider with any small provider. Use Thunderbird, it's honestly better that it has been in maintenance-only mode for a decade and isn't being "innovated".