Did you check this article to solve the error - https://learn.microsoft.com/en-us/microsoft-365/security/office-365-security/mfi-non-delivery-report?view=o365-worldwide
Error: The message was not delivered.
Пүрэвжаргал Ганболд
1
Reputation point
Hi,
My order email has stopped going. how to fix it
error message:
Error: The message was not delivered. A non-delivery report (NDR) message was sent to .....The NDR might provide more details about why the email message wasn't delivered and how to fix the issue.