Cisco Cisco Email Security Appliance X1050 Guía Del Usuario
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Cisco AsyncOS 9.0 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.
X1070, C670 and C370 customers: By default, the
systemsetup
command configures two listeners —
one public and one private. (For more information on the types of listeners available, see
.)
C170 customers: 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
The following examples of creating a public and private listener apply to X1070, C670, and C370
customers only. C170 customers should skip to the next section
customers only. C170 customers should skip to the next section
.
In this example portion of the
systemsetup
command, a public listener named InboundMail is
configured to run on the PublicNet IP interface. Then, it is configured to accept all email for the domain
example.com
. An initial SMTP route to the mail exchange
exchange.example.com
is configured. Rate
limiting is enabled, and the maximum value of 4500 recipients per hour from a single host is specified
for the public listener.
for the public listener.