Adding Useful Headers to Inbound Mail with Ironport Message Filters

We recently had a health check performed on our Ironport appliances by Cisco, and the following message filter was recommended to me by Dalton Hamilton, the engineer who worked the engagement for Cisco.

This filter adds several useful headers to all inbound mail.

addHeaders:  if (sendergroup != "RELAYLIST")
{
     insert-header("X-IronPort-RemoteIP", "$RemoteIP");
     insert-header("X-IronPort-MID", "$MID");
     insert-header("X-IronPort-Reputation", "$Reputation");
     insert-header("X-IronPort-Listener", "$RecvListener");
     insert-header("X-IronPort-SenderGroup", "$Group");
     insert-header("X-IronPort-MailFlowPolicy", "$Policy");
}

Thanks, Dalton!