By reading about the new inclementations on Google I decided to leave from Google services entirely, already stoping using Windows for 6 month and Chrome, but sttil dont sure about a gmail(Some important things are signed in gmail accont) and some services like Youtube and some android telemetry(already rooted)
You would not have to do that if you just use an email provider that allows custom domains. Probably will have to pay up though.
I’ve heard that self-hosting your own email server is almost always a bad idea as it can/will get blacklisted.