Article ID: 2885002 - View products that this article applies to.
Some email messages that you receive from internal senders are unexpectedly moved to the Junk E-mail folder in Microsoft Outlook. This problem occurs even if the messages are stamped as having a Spam Confidence Level (SCL) value of -1 in Microsoft Exchange Server.
This problem may occur if the encryption between Outlook and Exchange Server becomes disabled. In this situation, Outlook cannot verify that the message was delivered through a secure connection. Therefore, Outlook ignores the SCL value of -1 and treats the message as if it had an SCL value of 0 (zero).
You can work around this problem if your mailbox is located in either of the following environments:
Microsoft is researching this problem and will post more information in this article when the information becomes available.
For more information about junk email filtering with Exchange Online, see the following Microsoft website:
Plan for Exchange Online security
For more information about how to configure Junk email settings in Outlook, see the following Microsoft website, depending on the version of Outlook that you are using:
Outlook 2013: Configure junk email settings in Outlook 2013
Outlook 2010: Plan for limiting junk e-mail in Outlook 2010
Outlook 2007: Plan for limiting junk e-mail in Outlook 2007
Article ID: 2885002 - Last Review: September 24, 2013 - Revision: 2.0