I don’t think many people have read RFC 5322 (I haven’t), but most non-technical people I know understand these things about email:
- There are different service providers, and people can email each other no matter which provider they use
- There are different email apps
- Some apps are tied to specific service providers and others are not
I do lament the overall level of tech literacy.
It’s quite resistant to any single entity’s censorship, but if you share things most server admins consider unacceptable, other servers will block your server.
At least one of the Lemmy developers is a hardcore communist, and some people see lemmy.ml as a little sketchy for that reason. I see you found another server, which is exactly how federation is meant to work. While the overall culture tends to be left-leaning, most server admins are not hardcore communists and don’t censor political positions that aren’t advocating violence or discrimination.