If you are configuring journal rules for the first time, you need to specify the alternate Journaling recipient for undeliverable journal reports. If a journal report can’t be delivered to the Journaling mailbox specified in a Journal rule, non-delivery reports in Office 365 are queued in Exchange Online for some time.
You are not allowed to define journal rules if NDR setting is disabled or email id is not assigned to receive non-delivery reports.
Any mail sent to the address used for undeliverable journal reports won’t be journaled and won’t honor transport and mailbox rules settings. It’s recommended that you create a dedicated mailbox for undeliverable journal reports.
Log in to the Office 365 domain Admin center.
Navigate to Admin > Exchange Admin > compliance management > journal rules
Click Select address to specify NDR email recipient on Office 365 domain.
– You can change this id later if required.
– It is recommended to dedicate a separate email id to receive all the undeliverable journal reports.
Browse and select the id from the list.
Click OK to acknowledge the warning displayed on the screen.