Cisco Cisco Content Security Management Appliance M1070 Mode D'Emploi

You can define up to 10,000 routes. The final default route of 

ALL

 is counted as a route against this limit. 

Therefore, you can define up to 9,999 custom routes and one route that uses the special keyword 

ALL

. 

Use the special keyword 

USEDNS

 to tell the appliance to do MX lookups to determine next hops for 

specific domains. This is useful when you need to route mail for subdomains to a specific host. For 
example, if mail to example.com is to be sent to the company’s Exchange server, you might have 
something similar to the following SMTP route: 

example.com exchange.example.com

However, for mail to various subdomains (foo.example.com), add an SMTP route that looks like this: 

.example.com USEDNS

Incoming: if one message has 10 recipients and they are all on the same Exchange server, AsyncOS will 
open one TCP connection and present exactly one message to the mail store, not 10 separate messages.

Outgoing: works similarly, but if one message is going to 10 recipients in 10 different domains, AsyncOS 
will open 10 connections to 10 MTAs and deliver them one email each.

Splintering: if one incoming message has 10 recipients and they are each in separate Incoming Policy 
groups (10 groups), the message will splinter even if all 10 recipients are on the same Exchange server. 
Thus, 10 separate emails will be delivered over a single TCP connection.

If an Outbound SMTP Authentication profile has been created, you can apply it to an SMTP Route. This 
allows authentication for outgoing mail in cases where the Cisco Content Security appliance sits behind 
a mail relay server that is at the edge of the network. 

On the Security Management appliance, choose Management Appliance > Network > SMTP Routes.

Use this page to manage SMTP Routes on your appliance. From this page you can add, modify, and 
delete mappings in the table. You can export or import the SMTP Routes entries.