The email that you are viewing is most likely a piece of spam, trying to get you to enter your contact/billing information. Do not open the email, just delete it.
Since email is not secure by nature, people can "spoof", or fake the email headers. This will make it appear as though it was sent from someone else. When an email is sent, if it does not find the target recipient, it will return to the domain it was from, whether forged or not.
If you have a question whether we sent you an email, we send all of our correspondence as firstname.lastname@example.org (unmonitored email address). If the email you received did not come from that address, it was someone else.