Cisco Cisco Email Security Appliance C170 Guia Do Utilizador

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 appliance sits behind a mail relay server 
that is at the edge of the network. For more information about Outbound SMTP Authentication, see 

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

Click Add Route on the Network > SMTP Routes page. 

Enter a receiving domain. This can be a hostname, domain, IPv4 address, or IPv6 address.

Enter a destination host. This can be a hostname, IPv4 address, or IPv6 address. You can add multiple 
destination hosts by clicking Add Row and entering the next destination host in the new row.

You can specify a port number by adding “:<port number>” to the destination host: 

example.com:25.

 

If you add multiple destination hosts, enter an integer between 

0

 and 

65535

 to assign priority to the hosts. 

0

 is the highest priority. See 

 for more information.

Submit and commit your changes.

Similar to the Host Access Table (HAT) and the Recipient Access Table (RAT), you can also modify 
SMTP routes mappings by exporting and importing a file. To export the SMTP Routes:

Click Export SMTP Routes on the SMTP Routes page.