Cisco Cisco Email Security Appliance C170 Guia Do Utilizador

Mail delivery policies cannot be configured so that mail is delivered to multiple ports on a single IP 
address (for example, port 25 for normal delivery and port 6025 for Cisco IronPort Spam quarantine). 
Cisco recommends running each delivery option on a separate IP address or host. Further, it is not 
possible to use the same hostname for regular email delivery and quarantine delivery. 

Listeners support both Internet Protocol version 4 (IPv4) and version 6 (IPv6) addresses. You can use 
either protocol version or both on a single listener. The listener uses the same protocol version for mail 
delivery as the connecting host. For example, if the listener is configured for both IPv4 and IPv6 and 
connects to a host that uses IPv6, the listener uses IPv6. However, if the listener is configured to only 
use IPv6 addresses, it cannot connect to a host that is only using IPv4 addresses.

The System Setup Wizard or the 

systemsetup

 command (CLI) initially configures the IP interfaces that 

run on the available Ethernet interfaces on the Cisco IronPort appliance. On Cisco IronPort C150 and 
C160 appliances, these Ethernet interfaces are labeled Data1 and Data2. On all other Cisco IronPort 
appliances, they are labeled Data1, Data2, and Management. You can edit these interfaces at a later time 
via the IP Interfaces page on the Network menu or the 

interfaceconfig

 command. If you have 

completed the GUI’s System Setup Wizard (or the 

systemsetup

 command) and committed the changes, 

at least one listener should already be configured on the appliance. (Refer to the settings you entered in 
the 

.) The specific addresses to accept mail for were entered at that time, as 

well as the first SMTP Routes (Network > SMTP Routes or 

smtproutes)

 entry. 

When you create a new listener via the System Setup Wizard, AsyncOS creates the listener with default 
values. However, when you create a listener manually, AsyncOS does not use these default SBRS values.

Use the Listeners page (Network > Listeners) or the 

listenerconfig

 command to configure listeners 

that run over available IP interfaces on the Cisco IronPort appliance. For more information about 
creating and configuring listeners, see the “Customizing Listeners” chapter in the Cisco IronPort 
AsyncOS for Email Advanced Configuration Guide. In “Using Virtual Gateway™ Technology” in the 
Cisco IronPort AsyncOS for Email Advanced Configuration Guide, the Cisco IronPort Virtual Gateway 
technology is explained, in which you can further define and group IP interfaces over one or many IP 
addresses, or groups of IP addresses.

In this configuration, the Enterprise Gateway configuration accepts email from the Internet and relays 
email to groupware servers, POP/IMAP servers, or other MTAs. At the same time, the enterprise gateway 
accepts SMTP messages from groupware servers and other email servers for relay to recipients on the 
Internet. 

Physical Ethernet interface

IP interface

Listener 

Port

IP address

Physical interface 

IronPort Email 

Security appliance