The business model seems to be subscription based which i like(decently priced imo).
i suggest you looking into supporting external mail clients like k9/fairemail. Emails being encrypted at rest would be big.(People like to keep their stuff private even from the provider). Having a web app is nice tho.
I made an alternative to Gmail. (port87.com)
Hi, I’m Hunter Perrin, and I made a new email service called Port87....