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 Office 365
- Microsoft Office 365 pre-upgrade
- Microsoft Exchange Server 2010 or an earlier version
To work around this problem, try to enable RPC encryption between Outlook and Exchange. To do this, follow these steps:
- In Control Panel, open the Mail item.
- Click Show Profiles.
- Select your profile, and then click Properties.
- Click E-mail Accounts.
- Select the Microsoft Exchange Server account, and then click Change.
- In the dialog box that contains your mailbox server and user name, click More Settings.
- In the Microsoft Exchange Server dialog box, click the Security tab.
- Click to select the Encrypt data between Microsoft Outlook and Microsoft Exchange check box, and then click OK.
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Important If the check box is unavailable (dimmed), you are most likely connected to Microsoft Exchange Server 2013 or you are using a mailbox in Office 365. In this case, RPC encryption cannot be enabled. Note that Outlook Anywhere (RPC over HTTPS) connections are secure as they are encrypted using Secure HTTP (HTTPS).
- Click Next,and then click Finish.
- Click Close, and then click OK.
This issue is fixed in the Outlook 2010 hotfix package that is dated February 11, 2014. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
Description of the Outlook 2010 hotfix package (Outlook-x-none.msp): February 11, 2014
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:
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: