In this chapter, you will learn the following:
• Security filtering engines that are available on the Email Security Appliance
• Technology underlying each filtering engine
• Enabling and configuration actions taken on identified messages
Security filtering is clearly the sine qua non of a product called the Email Security Appliance (ESA). This chapter explores the security filtering features—like anti-spam and antivirus—in depth. It also covers the zero-day virus capabilities of the Cisco Outbreak Filters feature and the use of other features, like content filters for security purposes.
The goal is to eliminate all kinds of unwanted messages from the environment entirely. At the very least, these junk messages ...