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Getting Started Guide 7.0 | 19
Configure the path to use the MTA (MX routing or SmartHost) under Destination of Path.
You need to configure something unique between the inbound and outbound path to distinguish
inbound from outbound mail flow. A very simple way to do this is to have them listen on different
ports or enter the IP address of the Exchange Server as the Source IP Contacting Path on the
outbound path.
Example
Given:
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 like this:
Source IP Listen On Destination
Inbound Any Any:25 (proxy) exch1.example.com:25
Outbound 10.100.0.10 Any:25 MX
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 Listen On Destination
Inbound Any Any:25 (proxy) exch1.example.com:25
Outbound Any Any:2525 MX
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.