Cisco Cisco Email Security Appliance C170 Guia Do Utilizador
Chapter 5 Configuring the Gateway to Receive Email
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Cisco IronPort AsyncOS 7.5 for Email Configuration Guide
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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.
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.
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
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
systemsetup
command).
Mail delivery policies cannot be configured so that mail is delivered to multiple
ports on a single IP address (for example, port 25 for normal delivery and port
6025 for IronPort Spam quarantine). Cisco recommends running each delivery
option on a separate IP address or host. Further, it is not possible to use the same
hostname for regular email delivery and quarantine delivery.
ports on a single IP address (for example, port 25 for normal delivery and port
6025 for IronPort Spam quarantine). Cisco recommends running each delivery
option on a separate IP address or host. Further, it is not possible to use the same
hostname for regular email delivery and quarantine delivery.
The System Setup Wizard or the
systemsetup
command (CLI) initially
configures the IP interfaces that run on the available Ethernet interfaces on the
Cisco IronPort appliance. On Cisco IronPort C150 and C160 appliances, these
Ethernet interfaces are labeled Data1 and Data2. On all other Cisco IronPort
appliances, they are labeled Data1, Data2, and Management. You can edit these
interfaces at a later time via the IP Interfaces page on the Network menu or the
Cisco IronPort appliance. On Cisco IronPort C150 and C160 appliances, these
Ethernet interfaces are labeled Data1 and Data2. On all other Cisco IronPort
appliances, they are labeled Data1, Data2, and Management. You can edit these
interfaces at a later time via the IP Interfaces page on the Network menu or the
interfaceconfig
command. If you have completed the GUI’s System Setup
Wizard (or the
systemsetup
command) and committed the changes, at least one
listener should already be configured on the appliance. (Refer to the settings you