Stop receiving mail at multiple versions of an email address
I have an @iCloud.com email address I use. I also continue to get mail at @Mac.com and @me.com versions of the address. How do I stop the mail coming to @Mac.com and @me.com addresses?
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If those are the original @mac.com and @me.com versions of the same iCloud address, you generally can’t turn them off separately. Apple keeps those older addresses associated with the same iCloud Mail account, so mail sent to any of them is delivered to the same inbox.
The only exception would be if they were separately created mail aliases. Those can be disabled or deleted in iCloud Mail settings.
So if your username is identical before @icloud.com, @me.com, and @mac.com, what you’re seeing is most likely expected behavior.