Cisco Cisco Email Security Appliance C170 Guia Do Utilizador

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:

A listener checks the information in the 

altsrchost

 table and directs the email to a particular interface 

after checking the masquerading information and before message filters are checked. 

Use these subcommands within the 

altsrchost

 command to create mappings in the Virtual Gateways 

via the CLI:

Like the HAT, the RAT, 

smtproutes

, and masquerading and alias tables, you can modify 

altsrchost

 

entries by exporting and importing a file. 

Use the 

export

 subcommand of the 

altsrchost

 command to export the existing entries to a file (whose 

name you specify). 

Outside of the CLI, get the file. (See 

 for more information.) 

With a text editor, create new entries in the file. The order that rules appear in the 

altsrchost

 table is 

important. 

Save the file and place it in the “altsrchost” directory for the interface so that it can be imported. (See 

 for more information.) 

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

The system will match username syntax against the Envelope Sender address 
up to the 

@

 sign. The 

@

 sign must be included. Example: 

username@

The system will match domain name syntax against the Envelope Sender 
address starting with the 

@

 sign. The 

@

 sign must be included. Example: 

@example.com

Create a new mapping manually. 

Display the current list of mappings. 

Remove one of the mappings from the table.