You can configure a setting called “SCL” (Spam Confidence Level) in the SMSMSE console. This corresponds to a setting in the Intelligent Message Filter in MS Exchange System Manager. Using these two settings, you can more finely control which messages get sent to the Junk E-mail folder based on Symantec’s rating of the message.

Changing the Store Action Threshold in Symantec Mail Security for Microsoft Exchange:
Grabbed from here.

Question/Issue:
This page describes how to control the Store Action Threshold (SAT) in Microsoft Exchange 2003. The SAT works with the Spam Confidence Level (SCL) that you specify in Symantec Mail Security for Microsoft Exchange to determine which messages are sent to the users’ Junk E-mail folders. By default, the SAT value is null. The null SAT forces all messages with an SCL value of 1 or greater to the user’s Junk E-Mail folder. You installed one of the following versions: -Symantec Mail Security 4.6 for Microsoft Exchange -Symantec Mail Security 4.5 for Microsoft Exchange -Symantec Mail Security 5.0 for Microsoft Exchange
Solution:
To change the Store Action Threshold

In the Exchange System Manager window, in the left pane, under Global Settings, right-click Message Delivery -> Properties.
In the Properties dialog box, on the Intelligent Message Filtering tab, on the Store Junk E-mail Configuration drop-down list, click the appropriate level.
Click OK.
Close the Exchange System Manager window.
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Note: You cannot set the store threshold higher than the gateway threshold.

After you have configured the global settings in the Message Delivery area, you need to enable Intelligent Message Filtering on the Default SMTP Virtual Server properties. Intelligent Message Filtering is installed by default as part of Exchange SP2, but it is not enabled. To enable it:

In the Default SMTP Virtual Server properties, on the General tab, click Advanced.
Select the IP address (or “All Unassigned” and click the Edit button.
Check the box for “Apply Intelligent Message Filter” and click OK.

If you want to verify the SCL rating on a message in Outlook, here is how to do it. This article was written for Outlook 2003. It will probably work in 2007, but the menus will probably be different.

Tags: Exchange, Intelligent Message Filter, Junk E-mail, SCL, Spam, Symantec Mail Security