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Office 365 - Junk Mail Filtering Issue

Number of views : 22
Article Number : KB0011672
Published on : 2017-01-25
Last modified : 2020-05-06 21:51:21
Knowledge Base : IT Public Self Help

On Saturday June 13, 2015 Microsoft made a change to the spam filter settings in Office 365. This change caused legitimate email to be delivered into the recipients’ junk mail folder through Monday afternoon June 15, 2015.


Impact to the UT Austin campus:

  • Many emails sent between Saturday June 13 and Monday June 15 may have been erroneously sent to a user’s junk mail folder.
  • This affects all users of Office 365, regardless of what email client they use. This includes all desktop and mobile clients and Outlook Web Access.


Please take the following action:

  • Check your junk mail folder to determine if any of your email has been impacted by this issue. If so, select them, right-click, and select "Mark as not junk." This will move them back into your inbox.


ITS remediation actions:

  • ITS has deactivated bulk mail detection in UT Austin’s Office 365 instance. Other aspects of Office 365's anti-spam detection continue to function, as well as the anti-spam features of our Ironport anti-spam appliances (which capture the bulk of spam prior to delivery). In addition, any individual spam mail blocking set up for mailboxes will continue to work without interruption.
  • ITS will continue to work with Microsoft to resolve the issues causing this to occur. Once we are assured Office 365’s bulk mail senders detection will not cause legitimate messages to be placed in the junk folder we will update campus and reinstate Microsoft’s bulk mail detection in our Office 365 instance.




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