Nathan, I am very pleased I found this thread! It is exactly what I have been looking for.
I have blocked *tons* of legitimate IP's from delivering mail to my server because of the overwhelming amount of SPAM.
However, using the instructions in the previous posts, I attempted a test message to spamhaus and it is telling me that my server is not blocking messages.
Did you get a successful block from them? If so, have you tried it lately? If it still works for you can you send me your template?
I also went to the osirusoft web site and it says it is down. I presently have ordb.org, spamcop.net, and spamhaus configured.
Thanks!
Tom