Spam confidence level (SCL) is a numerical value indicating the likelihood that an incoming email message is spam. SCL is a component of the Microsoft Exchange spam filter, Intelligent Message Filter (Exchange IMF).
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The Exchange IMF evaluates message headers, content and other components of incoming mail and assigns an SCL ranking between zero and nine. An SCL of nine identifies a message that is almost certainly spam and an SCL of zero a message that is highly unlikely to be spam.
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- SearchExchange.com offers more information in their Crash Course: Exchange Intelligent Message Filter.
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