How to report an email as spam or phishing or malware or clean to train the spam filter?

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, click Mail flow >> Message trace.

Step 4: Click Start a trace button on the top-left.

Step 5: Enter the details and find the message and view it.

Step 6: Scroll down to the bottom and click on Submit message and then select one from the drop-down.

Step 7: Click on New submission and fill the details.