When you subscribe to iCloud+, you can use up to five custom domains to send and receive email with iCloud. | by Dale Clifford | Internet Stack | Medium
How to Use a Custom Email Domain with iCloud Mail - Make Tech Easier
iCloud custom domain for an Apple email address - IONOS
How to Start Using Custom iCloud Domains for Email- The Mac Observer
Personalize iCloud Mail: How to Buy a Custom Email Domain in iOS | PCMag
Setting Up a Custom Domain for iCloud Email - MacStories
Setting Up a Custom Domain for iCloud Email - MacStories