aeroroar on Nostr: I don't agree with the conclusions. I have successfully run my own self-hosted email ...

I don't agree with the conclusions. I have successfully run my own self-hosted email server since the Snowden revelations with no deliberability problems to big players.
The ISPmail howtos on WorkAround.org are a good starting point. www.iredmail.org well in a pinch. You can host your own email server at home/work on your own hardware on a static IP address, or use a VPN tunnel to a cloud VPS for their static IP address. This provides the most security.
Or else you can run it in the cloud if convenience wins.
Either way, it's not impossible. It's achievable. And it brings some significant protections, technical and legal.