All of you on this list are familiar with how DNS works. You probably use spam blocking lists (SBL) for your email servers? In case someone is interested in building accurate SBL, Spamcop is a service that allows you to easily report spam by sending in the headers. It can be automated by procmail or whatever as well. Spamcop does a deep analysis of the headers of a message and totally ignores what address it may be spoofing. It's very accurate and send out (mostly ignored, but occasionally acted upon) abuse notices. The spam I get from VoIP companies (like the recent one which I got twice) was reported. If only a few of you start reporting this and other spam you receive, it feeds the spamcop list which is very accurate, yet fair in the way it operates, unlike some SBL. My intention in posting this isn't so much to start the inevitable discussion where someone now tries to trash everything I just said, but to inform those who might be interested, that you can help me and everyone else by reporting spam to spamcop.net. The usual caveat: YMMV /r