email aliases
How can I eliminate my email aliases?
MacBook Air 13″, macOS 10.14
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Add and manage email aliases for iCloud Mail on iCloud.com - Apple Support
says
"Turn off, turn on or delete an alias
You can turn an email alias on or off at any time. You can also delete
email aliases that you no longer want to use. While turning off an email
alias is temporary, deleting it is permanent. When an alias is turned
off or deleted, email sent to that alias is returned to the sender.
✽ In Mail on iCloud.com, click 
at the top of the Mailboxes list,
✽ then choose Settings.
✽ 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.
✽ Click Done. "