I want my e-mail address back! aka How to re-add a formerly deleted e-mail address to a custom domain on iCloud?
I successfully created a custom e-mail domain on icloud. Everything worked, until I decided to move info@customdomain.nl from iCloud family member A to B. After I deleted info@customdomain.nl from user A, there is no way to get it back. The error response is: host mx01.mail.icloud.com[IP#] said: 550 5.1.6 user no longer on system.
How do I get my e-mail address back??