me@mydomain.com mywife@mydomain.com mychild@mydomain.com
Each redirects to a different real email account. The idea is that everyone knows us by our mydomain.com address, but reality we can change different mail accounts. Eg, my daughter has one with her university, but in a couple years after graduation, she can use a gmail account but all of the people using mychild@mydomain.com will never know she switched.
As I understand it, if I change my mx record, all of them will go to fastmail, but really I want only me@mydomain.com to go to fastmail.
