This blog post is getting quite a bit of attention at the moment: https://cfenollosa.com/blog/after-self-hosting-my-email-for-twenty-three-years-i-have-thrown-in-the-towel-the-oligopoly-has-won.html

I’d like to highlight this comment on HN:

I agree with the pains, but the options are not juts Big Tech or self-hosting. There’s a myriad of not-big-tech email providers out there, for example there’s Posteo, who use open source software and green energy. They are going strong for 13 years now with 400+k accounts.

https://en.wikipedia.org/wiki/Posteo

Please consider this option if you’re fed up with self-hosting e-mail. We need a diverse ecosystem.