Use iCloud+ Custom Email Domain with Outlook for Windows

I think I found the solution. To re-state the issue:

Apple iCloud+ was used to create a custom domain for email.

Example: *** Email address is removed for privacy ***

Apple forces you to create an @icloud address when configuring the custom domain.

Example: *** Email address is removed for privacy ***

Setting up apple ios and mail on the mac understand the trickery and work perfectly. You send an email, and the email comes FROM *** Email address is removed for privacy ***

Outlook does NOT work so well. Emails come from *** Email address is removed for privacy ***. On the latest Outlook 365 (for me, it's version 2311, Build 17029), there is limited options to configure. It's trying to do everything for you. There are two built in ways to deal with this:

1. Go into the account settings, you can change the "reply to address" to be *** Email address is removed for privacy ***
2. While sending an email, you can click the drop down on the FROM button and you can type in *** Email address is removed for privacy ***

The result of each of the actions is the same. The emails that are received this way will show they came from *** Email address is removed for privacy ***

I tried something tonight and it seems to be working to solve this. Open the registry editor, and navigate to:

HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\Profiles<your profile name>

Press F3 and search for your icloud address (*** Email address is removed for privacy ***)

You should see a match further down in this same branch (make sure it is). Look for a field called "Email" and the value will be your icloud address (*** Email address is removed for privacy ***). Edit this field to be your custom domain address (*** Email address is removed for privacy ***).

Close outlook if it is open and re-open it. Emails should work normally now and the from address should be your custom domain.

Wow, I don't know how you discovered this but this solution worked for me. Thanks man.

Well, first thank you for finding the meanwhile well-hidden settings in Outlook. I configured it on the latest Outlook 365 for Windows (Classic View) and the test went through properly. However, any email I now try to send through my iCloud account (custom domain address) from Outlook hangs in the Outbox. Outlook seems to actively refuse to send mails via iCloud custom domains.

OK, did that but didn't find my iCloud address in there. Well, I searched the registry after I applied Stefan's suggestion. So I searched for my custom domain and found the key all set already as you suggest. So, Stefan's method already configured it correctly for me.

However, Outlook is now refusing to send emails. Well, Outlook does not complain, it simply lets the emails rot in the Outbox.

OK, did that but didn't find my iCloud address in there. Well, I searched the registry after I applied Stefan's suggestion. So I searched for my custom domain and found the key all set already as you suggest. So, Stefan's method already configured it correctly for me.

However, Outlook is now refusing to send emails. Well, Outlook does not complain, it simply lets the emails rot in the Outbox.

I am having the same issue, except that I am trying to implement this on a Mac.

Are there any options avaiable?

Many thanks

Tony

Hello,

I had the same issue.
Contacted Apple and Windows customer support, but couldn't resolve the issue.

I was able to make custom domain on iCloud+ work on outlook by doing the following. Hope it will work in your case too.

Go to Manage Apple Account

Go to Email&Phone numbers section.

By default, you iCloud.com email will be the primary email to sign in to AppleID/iCloud services.

Make your custom domain email the PRIMARY email for signing into iCloud/AppleID services.

Now you can go to outlook. Add account > enter custom domain email > generate app specific password > All set. You can send and receive emails using iCloud+ custom domain email.

Thanks