I can recommend both Zoho and Protonmail. User of both and each is great for its intended use, Zoho - commercial, multiple accounts with a custom domain, Protonmail for personal use and storage.
Lots of integrations, like their Zoho suite I don't need for personal use. I just use Apple calendar, and the notes app for writing which get the job done. Zoho for personal use is either bloat/ overkill, depending on how you look at it.