Dealing with the problem that is Gmail
Even if you run your own email server (or use a service like Federated Core), you will likely be interacting with those using Gmail.
https://mako.cc/copyrighteous/google-has-most-of-my-email-because-it-has-all-of-yours
It won’t happen quickly or over-night, but we must choke out Gmail and other centralized emails services (looking at your outlook.com) if we are to reclaim email as a “free” as in “freedom” service.