Cisco Cisco Email Security Appliance C160 Mode D'Emploi
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User Guide for AsyncOS 9.8 for Cisco Email Security Appliances
Chapter 5 Configuring the Gateway to Receive Email
Working with Listeners
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C170 and C190 appliances: By default, the System Setup Wizard walks you through configuring
one public listener for both receiving mail from the Internet and for relaying email from your
internal network. That is, one listener can perform both functions.
one public listener for both receiving mail from the Internet and for relaying email from your
internal network. That is, one listener can perform both functions.
•
To help test and troubleshoot the appliance, you can create a “blackhole” type listener instead of a
public or private listener. When you create a blackhole listener, you choose whether messages are
written to disk or not before they are deleted. (See the “Testing and Troubleshooting” chapter for
more information.) Writing messages to disk before deleting them can help you measure the rate of
receiving and the speed of the queue. A listener that doesn’t write messages to disk can help you
measure the pure rate of receiving from your message generation systems. This listener type is only
available through the
public or private listener. When you create a blackhole listener, you choose whether messages are
written to disk or not before they are deleted. (See the “Testing and Troubleshooting” chapter for
more information.) Writing messages to disk before deleting them can help you measure the rate of
receiving and the speed of the queue. A listener that doesn’t write messages to disk can help you
measure the pure rate of receiving from your message generation systems. This listener type is only
available through the
listenerconfig
command in the CLI.
illustrates a typical email gateway configuration created by the System Setup Wizard on
appliance models that have more than two Ethernet interfaces. Two listeners are created: a public listener
to serve inbound connections on one interface and a private listener to serve outbound connections on a
second IP interface.
to serve inbound connections on one interface and a private listener to serve outbound connections on a
second IP interface.
illustrates a typical email gateway configuration created by the System Setup Wizard on
appliance models that have only two Ethernet interfaces. One public listener on a single IP interface is
created to serve both inbound and outbound connections.
created to serve both inbound and outbound connections.