Other rules seem to be working just fine. I assume that something is preventing SpamAssassin from successfully performing these DNS lookups. Any ideas on how to best troubleshoot this further?
From the looks of it, pretty much all of your DNS based tests are failing, URI and conventional.
First, check the ability of the system to resolve anything:
host www.spamassassin.org
If that doesn't work, get your DNS resolv.conf set up properly so that it's got a working nameserver in the list.
