What happened to delivery reports?
Delivery reports in Microsoft 365 and Office 365 allowed users and administrators to discover and view delivery information about mail messages. Delivery reports for users have been discontinued and there is currently no direct replacement. Delivery reports for administrators have been replaced by the Message Trace feature.
For more information, see these topics:
Delivery reports for users and administrators is still available in on-premises Exchange environments. For more information, see Track messages with delivery reports.
Read receipts and delivery notifications are separate from delivery reports and are still available in Microsoft 365 and Office 365. For more information, see Add and request read receipts and delivery notifications.