Try using senderbase:http://www.senderbase.org
Not as accurate as it would appear. They list faked Received headers. We had a host at columbia.edu that did not send any mail (confirmed by its own logs and by our network traffic monitor) listed as the largest source of mail in the columbia.edu domain-- all because a spammer was pretending his mail originated at it, by a faked Received header. This went on for about a year, and we complained a few times, and they did not fix it. The spammer moved on eventually. There have been other listings there for columbia.edu that do not match the data we have for our network traffic. It's not reliable. Joseph Brennan Lead Email Systems Engineer Columbia University Information Technology
