This Domain Is Not In Your Dominion

(The company I work for is in the business of hosting websites. I receive a call from a customer who is having trouble logging into his control panel.)

Customer: “I can’t login to my website.”

Me: “What’s your domain name?”

Customer: “[username]@yahoo.com.”

Me: “That sounds like an email address to me, not a domain.”

Customer: “That’s my dominion.”

Me: “Your domain name should be something like www.[sitename].com.”

Customer: “Right, it’s [username]@yahoo.com.”

Me: “Sir, that’s not a domain name.”

Customer: “Yes, that’s my dominion!”