I assume since all my original email addresses are already part of the master domain, I wouldn't have to add those, just any new name+domain I want to add and since I'm doing this within my settings, it should just all work. Are they asking to enter my email (plus mac.com and me.com) or just the new one with the new domain? To me the ladder would be a new email address. This feature can be useful for confirming the receipt of mail, or for informing. You can create new email addresses after you’ve finished setting up your domain with iCloud Mail.' The confusing part is the last sentence. Auto-responders allows you to set up automated replies to incoming email. You’ll be asked to verify these during setup. They say to ' Add all of the email addresses that you currently use with this domain. Now it wants me to create the email name for each family member, if I want to. Easy and quick way to set up an auto-reply on Mac.
Going through the initial configuration, I select add the family plan iCloud domain. I have the 2TB iCloud storage plan so I already have an iCloud+ plan meaning I don't pay extra for these new services.