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Environment: Outlook User
Purpose: How to improve spam filters
Fine tune your Spam Filters
It’s frustrating to receive spam or phishing scam messages in your Inbox, or missing a legitimate email message because it's marked as junk. Microsoft is constantly fine-tuning their spam filters to be more accurate. You can help refine this process by following the steps below.
 
Report the message to Microsoft
 Outlook clients have built in reporting functionality to send messages classified incorrectly directly to microsoft for review.  To do this look for the "Report Message" button in your outlook view
Outlook Online  
Outlook Client 
 
 Blocking or Allowing Senders
 Outlook Online
 Outlook Client