Cisco Cisco Email Security Appliance C160 Guía Del Usuario
5-111
Cisco IronPort AsyncOS 7.1 for Email Configuration Guide
OL-22158-02
Chapter 5 Configuring the Gateway to Receive Email
POP/IMAP, and other message generation) systems. Public and private listeners,
by default, have different features available to them and different default settings.
By creating distinct public and private listeners for different public and private
networks, you can distinguish among email for security, policy enforcement,
reporting, and management. For example, email received on public listeners is
scanned by your configured anti-spam engine and the anti-virus scanning engine
by default, while email received on private listeners is not scanned. The same
illustration, with listeners, is shown in Figure 3-3.
by default, have different features available to them and different default settings.
By creating distinct public and private listeners for different public and private
networks, you can distinguish among email for security, policy enforcement,
reporting, and management. For example, email received on public listeners is
scanned by your configured anti-spam engine and the anti-virus scanning engine
by default, while email received on private listeners is not scanned. The same
illustration, with listeners, is shown in Figure 3-3.
Figure 5-3
Public and Private Listeners for an Enterprise Gateway
In Figure 3-3, one public listener (A) and one private listener (B) are configured
on the appliance in this Enterprise Gateway configuration.
on the appliance in this Enterprise Gateway configuration.
IronPort Email Security appliance
Internet
Large Small
ISPs
SMTP
SMTP
corporations
corporations
Firewall
Groupware server
(Exchange™, Domino™,
Groupware client
Groupwise™)
POP/IMAP server
POP/IMAP client
A
B