Strange email address from iCloud Mail

Hi everyone,

I reset my rMBP and set up the iCloud Mail. Signed in my Apple Account then I've gotten a welcome email from noreply@icloud.com that indicates my new email address is another email, not the one I signed in, it is a completely strange email that I've never heard before.

I really don't understand about this, I just want to delete that strange email and replace it.

Please help me.

Thank you

Phong Nguyen