>>> check logwrite = received_protocol=$received_protocol
>>> = received_protocol=smtp
LOG: received_protocol=smtp
->>> looking up host name for 1.2.3.4
+>>> looking up host name for 1.2.3.4
LOG: no host name found for IP address 1.2.3.4
>>> check logwrite = sender_host_name=$sender_host_name
>>> = sender_host_name=