I found this: https://kb.mailbox.org/en/private/custom-domains/using-emails-with-a-custom-domain/#specifics-for-family-accounts
So yes, you have to use a different MX record, but you can share a domain name with your family. I switched to them this week, but haven’t managed to decide on a family domain name, as we all have different last names 🙃. Will probably use multiple domains.


I haven’t actually set up a family account yet, so can’t answer on that, sorry!