Multiple domain support

Hello cobaltjacket,

Thanks for reaching out to Apple Support Communities. Upon review of your post, it seems that you have questions about using custom domains in iCloud. We can see why you’d want this taken care of, so let us help from here! Let’s start by reviewing this helpful article that was linked to your posting in case you’ve not yet explored it: Use Custom Email Domain with iCloud Mail. Were you able to go through these steps? You can have up to five custom domains to send and receive email with iCloud Mail. 

Please let us know if you have follow up questions, so we can continue assisting. Take care!