Руководство Пользователя для Cisco Cisco Email Security Appliance C170

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 
X1000/1050/1060/1070, C60/600/650/660/670, and C30/300/350/360/370 
customers only. Cisco IronPort C10/100/150/160 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. 

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 Cisco 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