Looking for an iCloud/Apple admin contact me off list.
I’ve exhausted all the usual support channels on this one and some of the responses have been quite comical.
Every time you setup an email account in Apple Mail it will check the domain entered against a database of email server settings and conveniently autofill those settings.
10 or so years ago we reached out to our business contact at Apple to setup email server auto discovery for our domain, over the last decade our contact has left and any attempts to reach Apple to get this info updated have been fruitless. The autofilled info now points to a long dead email server.
New Heights Foundation