Cisco Cisco Content Security Management Appliance M1070 Guida Utente

This chapter explains the features that affect routing and delivery of email traveling through the Security 
Management appliance, and use of the SMTP Routes page and smtproutes command. 

The Security Management appliance routes the following mail:

ISQ released messages which ignore SMTP routing

Alerts 

Configuration files that can be mailed to the specified destination 

Support request message that can be sent to the defined recipient as well 

The last two types of messages use SMTP routes to be delivered to the destination.

The Email Security appliance routes mail to local domains to hosts specified using the Management 
Appliance > Network > SMTP Routes page (or the smtproutes command). This feature is similar to 
the sendmail mailertable feature. (The SMTP Routes page and smtproutes command are an expansion 
of the AsyncOS 2.0 Domain Redirect feature.)

If you have completed the System Setup Wizard in the GUI 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 Cisco IronPort AsyncOS operating system allows up to ten thousand 
(10,000) SMTP Route mappings to be configured for your Cisco IronPort appliance. (See 

.)