It sounds like you likely misspelled the email wrong when you sent. Make sure to send any email questions to support@wizard101.com. The support team will respond to you within 24-48 hours.
Technical details of temporary failure: Google tried to deliver your message, but it was rejected by the recipient domain. We recommend contacting the other email provider for further information about the cause of this error. The error that the other server returned was: 451 451 4.7.1 Service unavailable - try again later (state 18).