If you received a bounce back email stating that the survey email was not delivered, it is most likely because there is an error with the email address. Please double check that the email address that was entered is correct. If it is not, you can remove that rater from your list and re-add them back using the corrected email address. Once they've been added, you must send another Invitation email using the Invite button.
If you find that the email address is correct but the email was still not delivered to the rater, please Submit a Request or contact our Support team for assistance.