Cisco Cisco Email Security Appliance C370D Guia Do Utilizador
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Cisco AsyncOS 9.1 for Email User Guide
Chapter 3 Setup and Installation
Using the System Setup Wizard
Create a Listener
A “listener” manages inbound email processing services that will be configured on a particular IP
interface. Listeners only apply to email entering the Email Security appliance — either from your
internal systems or from the Internet. Cisco 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
listener (or even a “SMTP daemon”) running for IP addresses you specified above.
interface. Listeners only apply to email entering the Email Security appliance — either from your
internal systems or from the Internet. Cisco 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
listener (or even a “SMTP daemon”) running for IP addresses you specified above.
For C370, C670, X1070, C380, C680 appliances: By default, the
systemsetup
command configures
two listeners — one public and one private. (For more information on the types of listeners available,
see
see
.)
For C170 appliances: By default, the
systemsetup
command configures one public listener for both
receiving mail from the Internet and for relaying email from your internal network. See
.
When you define a listener, you specify the following attributes:
•
A name (nickname) created by you to refer to the listener later. For example, the listener that accepts
email from your internal systems to be delivered to the Internet may be called OutboundMail.
email from your internal systems to be delivered to the Internet may be called OutboundMail.
•
One of the IP interfaces (that you created earlier in the
systemsetup
command) on which to receive
email.
•
The name of the machine(s) to which you want to route email (public listeners only). (This is the
first
first
smtproutes
entry. See
•
Whether or not to enable filtering based on SenderBase Reputation Scores (SBRS) for public
listeners. If enabled, you are also prompted to select between Conservative, Moderate, or Aggressive
settings.
listeners. If enabled, you are also prompted to select between Conservative, Moderate, or Aggressive
settings.
•
Rate-limiting per host: the maximum number of recipients per hour you are willing to receive from
a remote host (public listeners only).
a remote host (public listeners only).
•
The recipient domains or specific addresses you want to accept email for (public listeners) or the
systems allowed to relay email through the appliance (private listeners). (These are the first
Recipient Access Table and Host Access Table entries for a listener. See
systems allowed to relay email through the appliance (private listeners). (These are the first
Recipient Access Table and Host Access Table entries for a listener. See
and
for more
information.)
Related Topics
•
•
•
Public Listener
Note