How to creat an iCloud email
How to create an iCloud email
iPhone 12 Pro Max, iOS 15
Question marked as
Each AppleID account has an associated email account that can be activated from your device settings:
Settings > [Your Name / AppleID] > iCloud Mail > iCloud Mail - set to ON
More information can be found in the iCloud User Guide:
Set up iCloud for Mail on all your devices - Apple Support