I don't think email is the issue here but it is DNS. Email relies on DNS and unfortunately government and ISPs have too much control to take your domain or have it blocked.

Democratic governments having that power seems reasonable: they have to follow a legal process and seizing a domain is rare — if I was worried about government overreach I’d want, say, physical detention to be as fair a process as seizing a domain or bank account is.

ISPs can’t take your domain and blocking is quite rare - usually just active malware attacks - but that seems like an argument for regulating them as utilities because they’re a natural chokepoint and as such many people do not have the option of switching.

The same goes for a normal address. Need one for employment and is arguably a human right.

And yet, it can be taken from you with a court order.