My iCloud mail has disappeared.

It was helpful but not the remedy you were seeking. No the same thing.

In any case you did not ask the original question so you have even less right to criticise my response to cpowell208.

so...

Settings, your name, iCloud

Turn off Mail

Settings, your name, iCloud

Turn on Mail

If you still have no iCloud account reach out to Apple Support at the top of this page.

Settings, your name, iCloud

Turn on Mail

Not at all helpful. Mail is turned on in iCloud.