I've bumped into this one. There are two people who have close variations of my email address.

One is in Kansas City and mistakenly attached his power bill to my email. When I tried to notify them, they wanted to turn off the account entirely. I demanded they contact the person via the phone number on the account before making any changes.

The second recently purchased a house so I got all his closing docs. Even after notifying the real estate agent listed and the title company, I still got a few confirmations.