The way Fastmail is setup is that there's a master administrator login for each account, and then you create email addresses under that account with their own l

The way Fastmail is setup is that there's a master administrator login for each account, and then you create email addresses under that account with their own logins. So if you somehow lose control of an email login, you can just get your administrator to login and reset it for you. Presumably if you needed the administrator account reset, you would have to contact Fastmail support, but you don't tend to log in to those much at all so there's less chance of them being stolen.