the last byte of the return is a number from 1-255. This is the hosts
1 means "not only have we never seen ham come from this host, it has all
kinds of danger signals that indicate you shouldn't ever trust them to do
anything useful".
You probably really need one bit somewhere that says "this is a client PC"
or something like that.
If you think about it, the average home PC that is a zombie sends absolutely
nothing but spam to everyone but its owning ISP, so deserves a 1 rating by
your posited rule. But the owning ISP also see actual legit mail from the
clueless owner of the system that has no idea that the PC is sending
zillions of spam messages every second while he is uploading pictures from
his most recent party. So the owning ISP will want to rate that PC as
somewhere between 255 and 2.
There needs to be some way to resolve the fact that one major ISP sees this
as a slightly valid system, but everyone else sees it as absolute junk.
Loren
