If you receive an email without a username, it's because we have no accounts associated with your email address. It's possible that your account registration didn't complete properly or that you signed up with a different email address.

If you think you signed up with an alternate email address, then you may want to enter that email address into our "Forgot Username" form (http://www.youtube.com/forgot_username). If that doesn't help, try signing up again (http://www.youtube.com/signup).