LookBackOne = [ true | false ]
The LookBackOne slow.conf configuration item, if true, cause the milter to ignore the IP number if it is one of the MX servers found for the local host. Instead of using the connecting IP number, Received: headers will be screened to locat the IP number that connected to tht MX server.
When slowmilt first starts to run, it looks up the MX records for the local host (or the host defined by the LocalHostName configuration item). It does this so that it can detect if a message was from one of its MX servers.
By default, LookBackOne is defined to false. If you do not run this milter on your MX servers, you should define this item as true.