In this chapter, you will learn the following:
• Brief overview of the Cisco IronPort Email Security products
• A history of the AsyncOS software releases that run the Email Security Appliances
• Basic topics of Internet email, focusing on the Simple Mail Transfer Protocol
• Definition of email security and overview of the threat landscape
The Cisco IronPort Email Security Appliance (ESA) family was launched in 2003. IronPort Systems, then an independent security company, created ESA as a self-contained hardware and software product to provide high-performance email security. The goal was to provide a single product that accepted, filtered, and ...