Cisco Cisco Email Security Appliance C170 Guia Do Utilizador

Note that four separate IP interfaces can be used to deliver mail, where only one public listener is 
configured to accept messages from the Internet. 

The 

altsrchost

 command provides the simplest and most straightforward method to segment each 

appliance into multiple IP interfaces (Virtual Gateway addresses) from which to deliver email. However, 
users requiring more power and flexibility in mapping messages to particular Virtual Gateways should 
investigate the use of message filters. See 

 

for more information. 

The 

altsrchost

 command allows you to control which IP interface or interface group to use during 

email delivery based on one of the following:

the sender’s IP address

the Envelope Sender address

To specify which IP interface or interface group the system will deliver email from, you create mapping 
keys that pair either the sender’s IP address or the Envelope Sender address to an IP interface or interface 
group (specified by interface name or group name). 

AsyncOS will compare both the IP address and Envelope Sender address to the mapping keys. If either 
the IP address or Envelope Sender address matches one of the keys, the corresponding IP interface is 
used for the outbound delivery. If there is no match, the default outbound interface will be used.

The system can match any of the following keys and take preference in the following order:

The IP address of the sender must match exactly.

Example: 

192.168.1.5

The Envelope Sender must match the entire address exactly.

Example: 

username@example.com