You received a test email that shows someone else's information in the "To" field as well as the "This email was sent to" part of the footer. Why doesn't it display your email address?
When testing emails from your account, the system will merge in a random contact from the segment assigned to the email campaign. It is common to see that the email in the To field and in the footer are not your email address. This occurs to accommodate for any merged information validation being used in the email campaign.