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Microsoft provides the following tools for users to report good and bad messages:

Built-in reporting in Outlook on the web (formerly known as Outlook Web App or OWA).
The Microsoft Report Message or Report Phishing add-ins. The add-ins work on virtually all Outlook platforms, including Outlook on the web.
Adding senders to the Safe Senders list
Sometimes mail goes into a Quarantine state because the message is potentially dangerous. Only release emails from quarantine that you know to be safe. If you do not release a message from the Quarantine, it will automatically be deleted after 30 days