How to check email logs or trace messages of email from Exchange admin center?

Step 1: Sign in with your Office 365 admin account.

Step 2: On the left pane, click Exchange to open Exchange admin center.

Step 3: In Exchange admin center, click mail flow on the left pane.

Step 4: Click on the message trace tab on the top of the page.

Step 5: Enter the Sender and Recipient address and click the Search button.