Cisco Cisco Email Security Appliance C160 Mode D'Emploi

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 

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.

Rate-limiting per host: the maximum number of recipients per hour you are willing to receive from 
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 

 and 

 for more 

information.)

The following examples of creating a public and private listener apply to C370, C670, X1070, C380, 
C680 appliances only. For C170 appliances, 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. 

The value you enter for maximum recipients per hour you are willing to receive from a remote host is a 
completely arbitrary value, one that is usually relative to the size of the enterprise for which you are 
administering email. For example, a sender who sends 200 messages in an hour might be considered a 
“spammer” (sender of unsolicited bulk email), but if you are configuring the Email Security appliance 
to handle all email for a 10,000 person company, 200 messages per hour from a remote host may be a 
reasonable value. Conversely, in a 50-person company, someone sending 200 messages in an hour to you 
may be an obvious spammer. You must choose an appropriate value when you enable rate-limiting on a 
public listener (throttle) inbound email for your enterprise. For more information on Default Host Access 
policies, see 

The default host access policy for the listener is then accepted.

You are now going to configure how the appliance accepts mail by 

creating a "Listener".