Spammers are users too. You can't spell "abuser" without "user." You are inherently trying to diminish the power of the abuser users. No spam mitigation solution can ever answer, "yes," to that question without the qualification that at least some users, the abusers, will be disempowered. The equation will always come to balancing how hard you hit the spammers versus minimizing the collateral damage. Or it's another classic example of security versus usability.
But speaking of usability, email becomes IMMEDIATELY unusable if there is a technological "anti-spam" measure in place, be it something client-side like spamassassin or another RFC implemented server-side, that prevents even a single wanted email from getting to you. Especially if you are, for example, sitting at home on the phone with another person saying "Email me that file, again" and it's not going anywhere. At that point, email is 100% dead. Rob Nelson ronelson@vt.edu Rob Nelson ronelson@vt.edu