Allow all incoming emails to a custom email domain on iCloud.com

You can use your iCloud Mail email address as a catch-all address. This allows you to receive all emails sent to your custom email domain, even if the exact address they were sent to hasn’t already been created.

Note: You must be the domain owner to use this feature. You won’t receive emails sent to addresses that have been previously created for other members of the domain.

Go to icloud.com/icloudplus, sign in to your Apple Account (if necessary), then click Custom Email Domain.
Tip: If you’re already on iCloud.com, you can also click in the toolbar, then click Custom Email Domain.
Select a domain name, scroll down, then click Turn On Allow All.

If the domain owner allows all incoming emails, any emails that aren’t sent to an active email address go to the domain owner’s inbox. If this setting isn’t turned on, those emails are returned to the sender.

Note: Emails sent to deleted email addresses are automatically returned to the sender.

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iCloud User Guide

Allow all incoming emails to a custom email domain on iCloud.com