OK, I've got the exim book, and everything has been going swimmingly,
but now I seem to hitting a brick wall.
I have a situation where I need a couple of router rules that will do
the following (seperate rules):
1. examine the IP address of the sending host and if it is in a list (a
MySQL lookup, but that part is fine) send to a transport.
2. examine the domain name of the sending envelope and if it is in a
list (MySQL again) send to a transport.
In both these cases I want to skip the rule completely if the sending
host IP is in a fixed list (this is all to do with routing to and from a
dedicated virus scanning box).
