IronPort - Configuration Guide - AsyncOS 7.6.1

Hop 2
Hop 1
9-20
Firewall
MX
MTA
IronPort Email Security appliance
Figure 9-12 Mail Relayed by MX/MTA — Simple
Firewall
IP: 10.2.3.4
MX / MTA
IP: 10.2.3.5
Cisco IronPort AsyncOS 7.6 for Email Configuration Guide
Chapter 9 Anti-Spam
IronPort Email Security appliance
Figure 9-13 shows two other, slightly more complicated examples of how mail may be relayed inside the
network and how mail may be processed by several servers within the network before it is passed to the
Cisco IronPort appliance. In example A, mail from 7.8.9.1 passes through the firewall and is processed
by an MX and an MTA before being delivered to the Cisco IronPort appliance. In example B, mail from
7.8.9.1 is sent to a load balancer or other type of traffic shaping appliance and is sent to any one of a
range of MXs prior to being delivered to the Cisco IronPort appliance.
Figure 9-13 Mail Relayed by MX/MTA — Advanced
A B
IP: 10.2.3.6
IP: 10.2.3.4
IP: 10.2.3.5
Hop 2
Hop 1
IP: 7.8.9.1
Sending
Machine
MX
IP: 10.2.5.1-n
MX
IP: 10.2.6.1
Mail Filter
IP: 7.8.9.1
Sending
Machine
OL-25136-01