Comment by neop1x

I like your enthusiasm but I am afraid you are overambitious. For me, it sounds a bit like GSuite alrernative hosted on Google Cloud. It doesn't make sense to me. What is the advantage of it being opensource when it is hosted by you. I have been hosting my own NextCloud instance on a bare metal server for years, email (exim, dovecot, roundcube), dns (bind) and it all replaced gsuite for me, they are awesome libre and OSS projects. Of course managing it is not easy and not something every enduser should be doing. But this is how the internet was expected to work in the beginning - decentralized. If you start building gsuite alternative, you will end up being gsuite anyway because of all the availability and large-scale management. You will be using third party public clouds, networks and it will be expensive and you won't be able to guarantee it will continue to work for next years and people don't want their email to stop working. Anyway, good luck! I would like to be wrong!