Cisco Cisco Email Security Appliance C170 Guia Do Utilizador

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 command) 

In 

 you customized private and public 

listeners to service SMTP connections for an Enterprise Gateway configuration. 
Those listeners were customized to handle specific connections (via HAT 
modification) and receive mail for specific domains (via RAT modification of 
public listeners). 

The IronPort appliance routes mail to local domains to hosts specified via the 
Network > SMTP Routes page (or the 

smtproutes

 command). This feature is 

similar to the sendmail 

mailertable

 feature.

If you have completed the GUI’s System Setup Wizard (or the Command Line 
Interface 

systemsetup

 command) as described in the “Setup and Installation” 

chapter of the Cisco IronPort AsyncOS for Email Configuration Guide and 
committed the changes, you defined the first SMTP route entries on the appliance 
for each RAT entry you entered at that time.

SMTP Routes allow you to redirect all email for a particular domain to a different 
mail exchange (MX) host. For example, you could make a mapping from 

example.com

 to 

groupware.example.com

. This mapping causes any email with 

@example.com

 in the Envelope Recipient address to go instead to 

groupware.example.com

. The system performs an “MX” lookup on 

groupware.example.com

, and then performs an “A” lookup on the host,

 

just like 

a normal email delivery. This alternate MX host does not need to be listed in DNS 
MX records and it does not even need to be a member of the domain whose email 
is being redirected. The IronPort AsyncOS operating system allows up to forty 
thousand (40,000) SMTP Route mappings to be configured for your IronPort 
appliance. (See 

.)