Yes, you can use your Apple ID email address’s domain (e.g., firstname@lastname.com) with iCloud Custom Email Domain — but not as the same address that is your Apple ID login. You'll need to create a new iCloud Mail address using the same domain.
Apple’s Conflicting Guidance
Apple has said:
- “An Apple ID email address can’t be used as a custom domain email.”
- “A secondary Apple ID email address can’t be used as a custom domain email.”
The reality:
- What they mean is: you cannot move the exact email address that’s tied to your Apple ID (e.g., you@yourdomain.com) into iCloud Mail for sending/receiving.
- But you can set up that domain (yourdomain.com) as a custom domain in iCloud Mail.
- You can then create new aliases like mail@yourdomain.com or info@yourdomain.com, and use those through iCloud Mail.
- The Apple ID login address remains intact and untouched.
How to Do It (Safely)
- Leave your Apple ID login email as-is (firstname@lastname.com)
- Do not try to convert that address into an iCloud Mail address
- Go to https://www.icloud.com/settings > Custom Email Domain
- Add your domain (e.g., lastname.com)
- Set up DNS records as instructed
- Create a new email like hello@lastname.com (you can’t use your Apple ID email here)
- Start using this new iCloud-hosted address
Your domain can be hosted by Apple for mail, even if your Apple ID address is part of that domain — you just can’t rehost the exact Apple ID address under iCloud Mail.
Important Caveats
- You cannot delete or repoint the Apple ID email address to use iCloud Mail
- You cannot receive email to your Apple ID address via iCloud if it’s already tied to Google Workspace or elsewhere
- Trying to move the Apple ID address itself may cause Apple ID login or iCloud sync issues
