Cisco Cisco Email Security Appliance C160 Mode D'Emploi

If you are using Virtual Gateway technology, information about each Virtual 
Gateway address is also displayed. The command requires you to input the 
domain of the host information to be returned. DNS information stored in the 
AsyncOS cache and the last error returned from the recipient host is also given. 
Data returned is cumulative since the last 

resetcounters

 command. 

The statistics returned are grouped into two categories: counters and gauges. In 
addition, other data returned include: last activity, MX records, and last 5XX 
error. 

Certain system parameters require settings at the system and Virtual Gateway 
address levels. 

For example, some recipient ISPs limit the number of connections they allow for 
each client host. Therefore, it is important to manage relationships with the ISPs, 
especially when email is being delivered over multiple Virtual Gateway addresses. 

See 

 for information about the 

destconfig

 command and how Virtual Gateway addresses are affected.

When you create a “group,” of Virtual Gateway addresses, the good neighbor table 
settings for Virtual Gateway are applied to the group, even if the group consists 
of 254 IP addresses.

For example, suppose you have created group of 254 outbound IP addresses set 
up as a group to cycle through in a “round-robin” fashion, and suppose the good 
neighbor table for 

small-isp.com

 is 100 simultaneous connections for the system 

and 10 connections for Virtual Gateway addresses. This configuration will never 
open more than 10 connections total for all 254 IP addresses in that group; the 
group is treated as a single Virtual Gateway address.

To ensure that specific recipients, recipient domains, or IP addresses never receive 
messages from the Cisco IronPort appliance, use the IronPort AsyncOS Global 
Unsubscribe feature. The 

unsubscribe

 command allows you to add and delete 

addresses to a global unsubscribe list, as well as enable and disable the feature. 
AsyncOS checks all recipient addresses against a list of “globally unsubscribed”