SonicWALL Email Security 6000 Getting Started Manual page 27

Example
Given this:
10.100.0.10: Exchange Server (exch1.example.com)
10.100.0.100: SonicWALL Email Security appliance (esa.example.com)
You might have two paths that look like this:
Source IP
Inbound Any
Outbound 10.100.0.10
In this scenario, any message that arrives at the SonicWALL Email Security appliance
from 10.100.0.10 will be treated as an outbound message, handed off to the MTA
component in the system, which will deliver the message via MX-lookup on the domain
in the TO field. Messages that arrive at the SonicWALL Email Security appliance from
any other IP address will be treated as an Inbound message, and delivered directly to
the Exchange server. The SonicWALL Email Security appliance always gives preference
to specific matches (for example an exact IP address match takes precedence over
"Any").
Another example using port numbers to distinguish which path a message should take:
Source IP
Inbound Any
Outbound Any
Another alternative would be to assign your SonicWALL Email Security appliance
multiple IP addresses, and have it listen on one for inbound and one for outbound.
In all of the above cases, the admin will configure Exchange to deliver outbound email to
the IP address and port number where the SonicWALL Email Security appliance is
listening for outbound mail.
To test your SonicWALL Email Security appliance, click the Auditing button at the top of
the SonicWALL Email Security appliance user interface and search for your sent email to
verify it has been sent and received.
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Listen On Destination
Any:25 (proxy) exch1.example.com:25
Any:25 MX
Listen On Destination
Any:25 (proxy) exch1.example.com:25
Any:2525 MX