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 almost certainly the number of candidates. On the other hand, top three out of a much smaller number doesn’t present voters with a lot of choice.