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Contents - Pg. vii

vii Contents Introduction Chapter 1 xxiii 1 1 Introduction to Email Security AsyncOS 3 3 Overview of Cisco IronPort Email Security Appliance (ESA) Security Management Appliances (SMA) History of AsyncOS Versions 4 Software Features Email Spam 6 Viruses and Malware 7 Protecting Intellectual Property and Preventing Data Loss Other Email Security Threats SMTP Commands 14 ESMTP Service Extensions 15 9 9 Simple Mail Transfer Protocol (SMTP) 5 Email Security Landscape 6 8