Cisco Cisco Email Security Appliance C170 Guia Do Utilizador
C H A P T E R
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Cisco IronPort AsyncOS 7.6 for Email Configuration Guide
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Configuring the Gateway to Receive Email
After you have configured the basic settings of your Cisco IronPort appliance via the GUI’s System
Setup Wizard (or the CLI
Setup Wizard (or the CLI
systemsetup
command), you are now ready to begin tailoring the
configuration of your Cisco IronPort Email Security appliance to receive email. This chapter discusses,
in detail, all of the features available to you as you begin to configure listeners on the appliance to handle
receiving email.
in detail, all of the features available to you as you begin to configure listeners on the appliance to handle
receiving email.
The concept of the Host Access Table (HAT) is introduced. The Host Access Tables (HATs) of public
listeners — with their specific sender groups and mail flow policies — provide the underlying
framework that makes possible the Mail Flow Monitor feature. (“Using Email Security Monitor” in the
Cisco IronPort AsyncOS for Email Daily Management Guide describes the Mail Flow Monitor feature
in detail.)
listeners — with their specific sender groups and mail flow policies — provide the underlying
framework that makes possible the Mail Flow Monitor feature. (“Using Email Security Monitor” in the
Cisco IronPort AsyncOS for Email Daily Management Guide describes the Mail Flow Monitor feature
in detail.)
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Receiving Email with Listeners
The Cisco IronPort AsyncOS operating system allows the Cisco 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.
inbound email gateway for your enterprise, servicing SMTP connections from the Internet, accepting
messages, and relaying messages to the appropriate systems.
In this configuration, you enable 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 Cisco IronPort appliance — either from the internal systems within your network or from
the Internet. Cisco 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
processing service that will be configured on a particular IP interface. Listeners only apply to email
entering the Cisco IronPort appliance — either from the internal systems within your network or from
the Internet. Cisco 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
systemsetup
command).