Hostkarma List Compatibility

[Marc Perkel]

BTW, I appreciate it that you are interested enough in my 
black/white/yellow lists that you're writing code for it. If there's 
anything you would like me to do on my end to make it easier let me know.

Also, I don't know if you can do this in Postfix or Spam Assassin but my 
lists do more than just IP based lookups. It also has white lists and 
black lists based on the host name and it's extremely effective. In Exim 
it's very easy to do this but it would be nice to not limit it to just 
Exim. The idea is that you get the forward confirmed hostname and look 
that up in the HostKarma list. This works very well for me and if others 
started doing this too I'm sure that the spam filtering community would 
do it better than I am.