Cisco Cisco Email Security Appliance C160 用户指南
23-4
Cisco AsyncOS 8.5.5 for Email Security User Guide
Chapter 23 Configuring Routing and Delivery Features
Routing Email for Local Domains
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.
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.
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 appliance sits behind a mail relay server that
is at the edge of the network. For more information about Outbound SMTP Authentication, see
allows authentication for outgoing mail in cases where the appliance sits behind a mail relay server that
is at the edge of the network. For more information about Outbound SMTP Authentication, see
.
Managing SMTP Routes to Send Outbound Email Using the GUI
Use the Network > SMTP Routes page to manage SMTP Routes on your appliance. You can add, modify,
and delete mappings in the table. You can export or import the SMTP Routes entries.
and delete mappings in the table. You can export or import the SMTP Routes entries.
Adding SMTP Routes
Procedure
Step 1
Click Add Route on the Network > SMTP Routes 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.
destination hosts by clicking Add Row and entering the next destination host in the new row.
Note
You can specify a port number by adding “:<port number>” to the destination host:
example.com:25.
Step 4
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.
Step 5
Submit and commit your changes.
Exporting SMTP Routes
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:
SMTP routes mappings by exporting and importing a file. To export the SMTP Routes:
Procedure
Step 1
Click Export SMTP Routes on the SMTP Routes page.