This goes along the custom rule to match a forged Received line claiming to be your own mail server. The new addition to that is forging of X-Originating-IP.
eg: header LOCAL_MY_IP Received =~ /\bfrom 216\.98\.192\.5\b/i describe LOCAL_MY_IP Why would I get mail from my own server? score LOCAL_MY_IP 1.000 header LOCAL_X_ORIGIN X-Originating-IP =~ /\b216\.98\.192\.5\b/ describe LOCAL_X_ORIGIN Mail from a local server without shells. score LOCAL_X_ORIGIN 1.000 meta LOCAL_IM_YOU LOCAL_MY_IP && LOCAL_X_ORIGIN describe LOCAL_IM_YOU Spammer trying to claim to be my own server. score LOCAL_IM_YOU 1.000
