Cisco Cisco Email Security Appliance C190 Guia Do Utilizador

Using the 

listenerconfig

 command, you can configure a listener to not include the Received: header 

by default to all messages received by the listener.

For more information, see “Advanced Configuration Options” in the “Customizing Listeners” chapter of 
the Cisco IronPort AsyncOS for Email Advanced Configuration Guide.

You can configure a listener to automatically append a default domain to sender addresses that do not 
contain fully-qualified domain names; these are also known as “bare” addresses (such as “joe” vs. 
“joe@example.com”). 

For more information, see “SMTP Address Parsing Options” in the “Customizing Listeners” chapter of 
the Cisco IronPort AsyncOS for Email Advanced Configuration Guide.

Outgoing mail is tagged with a special key, and so if that mail is sent back as a bounce, the tag is 
recognized and the mail is delivered. For more information, see “IronPort Bounce Verification” in the 
“Configuring Routing and Delivery Features” chapter of the Cisco IronPort AsyncOS for Email 
Advanced Configuration Guide.

For each listener you configure, you can construct a domain map table which rewrites the envelope 
recipient for each recipient in a message that matches a domain in the domain map table. For example, 
joe@old.com -> joe@new.com

For more information, see “The Domain Map Feature” in the “Configuring Routing and Delivery 
Features” chapter of the Cisco IronPort AsyncOS for Email Advanced Configuration Guide.

For inbound email only, the RAT allows you to specify a list of all local domains for which the Cisco 
IronPort appliance will accept mail.

For more information, see 

Alias tables provide a mechanism to redirect messages to one or more recipients. Aliases are stored in a 
mapping table. When the envelope recipient (also known as the Envelope To, or 

RCPT TO

) of an email 

matches an alias as defined in an alias table, the envelope recipient address of the email will be rewritten. 

For more information about Alias Tables, see “Creating Alias Tables” in the “Configuring Routing and 
Delivery Features” chapter of the Cisco IronPort AsyncOS for Email Advanced Configuration Guide.