Cisco Cisco Email Security Appliance C160 Mode D'Emploi

Then, check the mailbox of the test account and confirm that the test message was correctly delivered 
based upon the actions you configured for the mail policy. 

For example: 

Was the subject line altered? 

Was your additional custom header added? 

Was the message delivered to an alternate address?

Was the message dropped? 

The Incoming Relays feature helps your Cisco IronPort appliance obtain the IP address of an external 
machine that is sending mail to the Cisco IronPort appliance via one or more mail exchange/transfer 
agents (MX or MTA), filtering servers, etc. at the edge of the network. In this type of configuration, the 
IP address of the external machine is not automatically known by the Cisco IronPort appliance. Instead, 
mail appears to originate from the local MX/MTA (the incoming relay) rather than from the external 
machine. Cisco IronPort Anti-Spam and Cisco IronPort Intelligent Multi-Scan depend on accurate IP 
addresses for external senders so it is vital for the Cisco IronPort appliance to have this information.

You should only enable this feature if you have a local MX/MTA relaying mail to your Cisco IronPort 
appliance.

 shows a very basic example of an incoming relay. Mail from IP address 7.8.9.1 appears to 

come from IP address 10.2.3.4 because the local MX/MTA is relaying mail to the Cisco IronPort 
appliance.

250 Message MID accepted

221 hostname

quit