If you have looked at Exchange Server’s anti-spam features or taken a peek at the headers of an email sent through an Exchange server you have probably encountered the term SCL before.

SCL stands for Spam Confidence Level.  It is the “score” that Exchange Server anti-spam assigns to an email based on the email’s contents.  This score is then used to make decisions as to how to handle suspected spam based on the thresholds that the Exchange administrator configures.

Having a detailed understanding of the SCL and how it is used in Exchange Server anti-spam will allow an email administrator to get good performance from their anti-spam deployment.

having a detailed understanding of the SCL and how it is used in Exchange Server anti-spam will allow an email administrator to get good performance from their anti-spam deployment.

About the Author

Paul Cunningham

Paul is a former Microsoft MVP for Office Apps and Services. He works as a consultant, writer, and trainer specializing in Office 365 and Exchange Server. Paul no longer writes for Practical365.com.

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