User Guide

CHAPTER
3-1
AsyncOS 9.1.2 for Cisco Email Security Appliances User Guide
3
Setup and Installation
• Installation Planning, page 3-1
• Physically Connecting the Email Security Appliance to the Network, page 3-5
• Preparing for System Setup, page 3-8
• Using the System Setup Wizard, page 3-14
• Verifying Your Configuration and Next Steps, page 3-39
Installation Planning
• Review Information That Impacts Planning Decisions, page 3-1
• Plan to Place the Email Security Appliance at the Perimeter of Your Network, page 3-1
• Register the Email Security Appliance in DNS, page 3-2
• Installation Scenarios, page 3-3
Review Information That Impacts Planning Decisions
• If you are configuring a virtual Email Security appliance, please see the Cisco Content Security
Virtual Appliance Installation Guide before continuing with this chapter.
• If you are configuring an M-Series Cisco Content Security Management appliance, please see
Chapter 42, “Centralizing Services on a Cisco Content Security Management Appliance”.
• We recommend reviewing Chapter 4, “Understanding the Email Pipeline” before installing, as some
features and functions may affect the placement of the appliance within your infrastructure.
Plan to Place the Email Security Appliance at the Perimeter of Your Network
Your Email Security appliance is designed to serve as your SMTP gateway, also known as a mail
exchange (MX). For best results, some features require the appliance to be the first machine with an IP
address that is directly accessible to the Internet (that is, it is an external IP address) for sending and
receiving email.
The per-recipient reputation filtering, anti-spam, anti-virus, and Virus Outbreak Filter features (see
SenderBase Reputation Service, page 6-1, IronPort Anti-Spam Filtering, page 13-3, Sophos Anti-Virus
Filtering, page 12-2, and Outbreak Filters, page 14-1) are designed to work with a direct flow of