IronPort - advanced configuration guide

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Cisco IronPort AsyncOS 7.6 for Email Advanced Configuration Guide
Chapter 2 Configuring Routing and Delivery Features
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.
SMTP Routes and Outbound SMTP Authentication.
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 IronPort appliance sits behind a mail
relay server that is at the edge of the network. For more information about Outbound SMTP
Authentication, see Outgoing SMTP Authentication, page 3-39.
Managing SMTP Routes via the GUI
Adding SMTP Routes
Use the Network > SMTP Routes page to manage SMTP Routes on your Cisco IronPort appliance. You
can add, modify, and delete mappings in the table. You can export or import the SMTP Routes entries.
Figure 2-1 SMTP Routes Page
To add an SMTP Route:
Step 1 Click Add Route on the Network > SMTP Routes page. The Add SMTP Route page is displayed:
Figure 2-2 Add SMTP Route Page
Step 2 Enter a receiving domain. This can be a hostname, domain, IPv4 address, or IPv6 address.
Step 3 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.
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