Hey Ned,
I found this very useful to test that the RBL was working:
http://www.spamhaus.org/faq/answers.lasso?section=Spamhaus%20SBL#207
"
How do I test my SBL setup?
Once you have set up your mail server to use sbl.spamhaus.org (or the preferred
zen.spamhaus.org), you can test to see if the SBL blocking is working by sending
an email (any email) to: nelson-sbl-test at crynwr.com (you must send the email
from the mail server which you wish to test). The ? Crynwr ? system robot will
answer you to tell you if your server is correctly blocking SBL-listed IP
addresses or not.
"
Just thought I'd throw it out there.
Thanks!
-will
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