You can set the message filtering threshold,
how content is analyzed, and what action to take when the filter detects junk email. The underlying
technology used is the Intelligent Message Filter (IMF), which existed in Exchange Server 2003 but is
now greatly improved. Microsoft Anti - spam Update Service provides updates regularly to ensure that
the most up - to - date information is always included when the Intelligent Message Filter runs.
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The Content Filter agent assigns a spam confidence level (SCL) rating to each message. The SCL rating
ranges from 0 to 9 with a higher rating indicating that a message is more likely to be spam. If a message
is detected to be spam, the Content Filter agent can be configured to delete the message, reject the
message, or quarantine the message. Some organizations may configure the Content Filter agent to
delete messages that have an SCL rating of 8 or higher, reject messages with an SCL rating of 7, and
quarantine messages with an SCL rating of 5.
To accommodate false positives, in which case a valid message is incorrectly tagged as spam, the spam
quarantine feature is available in the Content Filter agent to provide a temporary storage location for
messages that are identified as spam and that should not be delivered to a user mailbox inside the
organization.
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