We've told people for years that when they choose to use a DNSBL or RHSBL that they need to (a) subscribe to the relevant mailing list, if it has one and/or (b) periodically revisit the relevant web site, if it has one, so that they can keep themselves informed about any changes in its status or policies and/or (c) pay attention to what their own logs are telling them. They have not listened, for many values of "they". Maybe it's necessary to speak to them in a language they understand, despite the large downside of doing so. As someone who has had his own lapses into denseness, I can certainly understand that this isn't pleasant, but on the other hand, the lessons I've learned that way have been sufficiently clear that I've never made those particular mistakes again. I would argue that among the lessons here are "do not hardwire any DNSBL/RHSBL into any piece of software" "do not blithely use any such piece of software and assume it'll work" and "if you choose to use a DNSBL/RHSBL, then pay attention". <chuckle> Perhaps you should list (in the zone) all IP addresses which are repeatedly querying the zone -- after announcing this policy, of course. ;-) More seriously, I'll see what I can do to pass the word along in the faint hope that this will have some effect. ---Rsk