If you would like to add another Direct domain to your organization then you should complete a new registration. Each domain needs to be registered separately. NOTE: Registration is not for adding users. If you are trying to add a “user” mailbox (user@)...
If it is not available then it has already been registered in the system. Please select another subdomain until you have selected one that is available. If you believe you are the one who registered the subdomain in a registration you haven’t fully completed...