Add a Non-Delivery Report Email Address
A non-delivery report (NDR) is typically sent to an email sender when a message cannot be delivered to let them know that an issue has occurred. Before creating a journal rule, Microsoft 365 requires that you specify a non-delivery email address to receive journal reports if they are not deliverable to the email address specified in a journal rule.
Important
If you already have an NDR email address in place in Microsoft 365, you do not need to complete the steps below.
Follow the steps below to add a non-delivery report (NDR) email address to Microsoft 365.
From the customer level in Email Security, go to Settings > Connections.
Under Step 1 Add a non-delivery report (NDR) to Microsoft 365, select More Details.
Select the copy
icon to copy your unique NDR email address.Go to https://compliance.microsoft.com/exchangeinformationgovernance/globalsettings.
Select Replace and paste your unique NDR email address in to the Send undeliverable journal reports to: field.
Select Save.
Next, you'll need to create a journaling rule to allow email flow through the Email Security service.