Apple i.d. alias

1. In Mail on iCloud.com, click  at the top of the Mailboxes list, then choose Preferences.
2. Click Accounts, select an iCloud Mail alias in the list, then do any of the following:

• • Turn off an alias: select “Disable alias”.
  • Turn on an alias: deselect “Disable alias”.
  • Delete an alias: click “Delete alias”, then click Delete.

1. Click Done.

You can't change/remove @iCloud.com, @me.com or @mac.com addresses unless it is an alias you created after the Apple ID was set up.

iCloud: About your @icloud.com, @me.com, and @mac.com email addresses.   *

iCloud - Create or change email aliases.   -