I was in your situation before - also surveillance concerned and learned
computer stuff mostly due to interest instead of education. Im now
self-hosting email successfully from home - not mailinabox - without being
spam-sorted by gmail and hotmail etc. If you (or someone else reading this)
wants to migrate to home-hosting, then my own findings on home email server
suites and some guides for self-hosting are here:
1.
https://useritsecurity.wordpress.com/self-hosting-guides-2/how-to-easily-host-your-own-email-server/
2. under Webaddress / Domain and below:
https://useritsecurity.wordpress.com/self-hosting-guides-2/self-hosting-general-guides/
I hope it's useful to someone.