After installing Symantec Mail Security for Exchange (SMSMSE) messages end up in the users Outlook Junk mail folder.
The Symantec Mail Security Spam Confidence Levels (SCL) and Microsoft Exchange´s SCL values cannot coexist. When both technologies trigger, there is a conflict in the SCL. As a result, legitimate mails will trigger an incorrect SCL value on the Exchange server and redirect the mail to the users junk mail folder. Alternatively the Premium AntiSpam action has been set to deliver to an alternate mailbox but instead are delivered to the users Junk Mail folder.
When SMSMSE is installed, Microsoft Antispam features such as Exchange 2003 IMF filtering and Exchange 2007/2010/2013 Mailbox Junk Email Configuration needs to be disabled. These can be disabled either by uninstalling/disabling the specific features on the Exchange server or on the individual Outlook clients. Consult Exchange server documentation for exact instructions on how to do this. Examples of documentation follow below:
Windows 2003, Windows 2008 Server, Windows 2012 Server
Exchange 2003, Exchange 2007, Exchange 2010, Exchange 2013
Outlook 2003, Outlook 2007, Outlook 2010, Outlook 2013
Symantec Mail Security for Exchange 6.x, 7.x
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