Cisco Cisco Email Security Appliance X1050 Guía Del Usuario
C H A P T E R
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Cisco IronPort AsyncOS 7.3 for Email Advanced Configuration Guide
OL-23081-01
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Customizing Listeners
In the Cisco IronPort AsyncOS for Email Configuration Guide, you learned how
the IronPort AsyncOS operating system allows the IronPort appliance to function
as the inbound email gateway for your enterprise, servicing SMTP connections
from the Internet, accepting messages, and relaying messages to the appropriate
systems by enabling listeners to service these connections.
the IronPort AsyncOS operating system allows the IronPort appliance to function
as the inbound email gateway for your enterprise, servicing SMTP connections
from the Internet, accepting messages, and relaying messages to the appropriate
systems by enabling listeners to service these connections.
A listener describes an email processing service that will be configured on a
particular IP interface. Listeners only apply to email entering the IronPort
appliance — either from the internal systems within your network or from the
Internet. IronPort AsyncOS uses listeners to specify criteria that messages must
meet in order to be accepted and relayed to recipient hosts. You can think of a
listener as an “email injector” or even a “SMTP daemon” running on a specific
port for each IP address you specify (including the initial addresses you
configured with the System Setup Wizard or
particular IP interface. Listeners only apply to email entering the IronPort
appliance — either from the internal systems within your network or from the
Internet. IronPort AsyncOS uses listeners to specify criteria that messages must
meet in order to be accepted and relayed to recipient hosts. You can think of a
listener as an “email injector” or even a “SMTP daemon” running on a specific
port for each IP address you specify (including the initial addresses you
configured with the System Setup Wizard or
systemsetup
command).
Note
If you have completed the GUI’s System Setup Wizard (or the Command Line
Interface
Interface
systemsetup
command) as described in the “Setup and Installation”
chapter of the Cisco IronPort AsyncOS for Email Configuration Guide and
committed the changes, at least one listener should already be configured on your
appliance.
committed the changes, at least one listener should already be configured on your
appliance.
This chapter describes how to use the Listeners page on the Network menu in the
GUI or the
GUI or the
listenerconfig
CLI command to customize some of the advanced
receiving properties of listeners configured on your IronPort appliance, including
creating new listeners. The following chapter,
creating new listeners. The following chapter,
describes how to customize the delivery properties of
listeners configured on the system.