<in reply to turetzsr>
Thanks for the links, but I really don't see any information on obtaining a copy of the reports or offending email. When I lookup the ip address, I get the following:
Causes of listing
SpamCop users have reported system as a source of spam less than 10 times in the past week
If I don't know what activity caused it to be listed in the first place, I cannot stop that activity.
I've never run an open relay or proxy server.