Apple email change.
How do I change my Apple email address?
How do I change my Apple email address?
iCloud: Create an iCloud Mail email address
If you set up iCloud using an Apple ID that doesn’t end with @icloud.com, you must create an @icloud.com email address on your iOS device or Mac before you can use iCloud Mail.
Note: If you set up iCloud using an Apple ID that ends with @mac.com or @me.com, you don’t need to set up an @icloud.com email address to use iCloud Mail. You already have an equivalent address that ends with @icloud.com.
If you don’t see onscreen instructions after turning on iCloud Mail on your iOS device or Mac, you already have a primary iCloud Mail email address. To create an email alias, see Use email aliases in Mail on iCloud.com.
After you set up your @icloud.com email address, you can use it to sign in to iCloud. You can still sign in using the Apple ID you used when you set up iCloud.
iCloud: Create an iCloud Mail email address - Apple Support
https://support.apple.com/kb/ph2620
Apple email change.