You can do individual single user plans if you use sub domains I think?

So say you had smith.com you could setup one account with the bob.smith.com sub-domain and another with sally.smith.com. That works great with wildcards, you can use amazon@bob.smith.com as your Amazon email etc.

The problem with that is what you set as your main email for outgoing etc. you could do something like personal@sally.smith.com or something. (You could just use something on the proton.me domain, but that kinda defeats the point of bringing your own)

Using a family account would let you have bob@smith.com and sally@smith.com but is a lot more expensive. I think it also means you can’t get your own wildcard inboxes without adding additional domains for them.