allow you to create, edit, and delete a listener. IronPort AsyncOS requires that you
specify criteria that messages must meet in order to be accepted and then relayed
to recipient hosts — either internal to your network or to external recipients on
the Internet.

These qualifying criteria are defined in listeners; collectively, they ultimately
define and enforce your mail flow policies. Listeners also define how the IronPort
appliance communicates with the system that is injecting email.

Each listener is composed of the criteria shown in

Table 1-1

Table 1-1

Criteria for Listeners

Name

Unique nickname you supply for the listener, for future
reference. The names you define for listeners are case-sensitive.
AsyncOS will not allow you to create two identical listener
names.

IP interface

Listeners are assigned to IP interfaces. The IP interface is
defined by the

interfaceconfig

command. Any IP interfaces

must be configured using the System Setup Wizard or the

systemsetup

command or the IP Interfaces page (or the

interfaceconfig

command) before you create and assign a

listener to it.

Mail protocol

The mail protocol to used for email receiving: either SMTP or
QMQP (only available via the

listenerconfig

command in the

CLI).