How to stop sending read read-receipts for all accounts from Exchange admin Center.

Step 1: Sign into your Office admin account via https://portal.office.com

Step 2: Navigate to Exchange admin center.

Step 3: On the left pane, scroll down and click More features.

Step 4: Click open under Permissions and Navigate to Mail Flow > Rules.

Step 5: Click + Add and select Modify messages and enter name as ‘Disable Read Receipt’.

Step 6: Select Apply to all messages in the Apply the rule if area.

Step 7: Select “Remove this header” and enter the text “Disposition-Notification-To” in the Do the following area.

Step 8: Click Save.