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At the server level, Microsoft Exchange will mark certain email messages as Junk E-mail. At the client level, the Microsoft Outlook email client will also mark certain email messages as Junk E-Mail.
To manage this filtering at the client level:
 
  1. Open Microsoft Outlook.
  2. On the Home tab of the ribbon, in the Delete section, click the Junk button.
  3. In the menu that appears, click Junk E-Mail Options...
  4. Select your preferred filtering option and click OK.
Keywords: outlook, email, junk, filters