Cisco Cisco Email Security Appliance C680 User Guide

The following example of creating a listener applies to C150/160 customers only. 

In this example portion of the 

systemsetup

 command, a listener named 

MailInterface is configured to run on the MailNet 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. Then, the same 

listener is configured to relay all email for all hosts within the domain 

example.com

. (Note the dot at the beginning of the entry: 

.example.com

)

Rate limiting is enabled, and the maximum value of 450 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 IronPort 
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 IronPort C160 accepts mail by 

creating a "Listener".

Please create a name for this listener (Ex: "MailInterface"):

[]> MailInterface

Please choose an IP interface for this Listener.