By telling Microsoft and other organizations which messages you consider to be junk email, you can help them improve their junk-detection technologies. Use the following junk email reporting options to report junk or unwanted email.
Junk email reporting
When you mark an email message as junk, the message is immediately moved to the Junk Email folder. Additionally, you have the option to report the message to Microsoft. You can choose to:
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Never send reports
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Automatically send reports
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Be asked about whether to send a report each time you mark a message as junk
Report unwanted email
When you mark a message as Junk, or when you unsubscribe from a sender, Outlook learns from that action to better understand what you consider to be junk. If you choose the option Share reports with other companies who fight junk email, Microsoft will share these findings.