Speaking as someone who runs their own private mail server (thunk.org), and having suffered from "collateral damage" when an entire ISP range was listed, and where I had absolutely no way of getting off a DNSBL that operating in a liability-free zone, with administrators who refused to communicate with me, and where I had no way of getting off the list, and thus had my e-mail blocked(*), forgive me if I'm a bit less sanguine than you about the suitability of DNSBL's, and whether your BCP will have any effectiveness whatsoever. If DNSBL operators are content to operate in the dark, and refuse to communicate, what makes you think they will pay attention to a BCP? (*) Fortunately in most cases it was people asking me for help with Linux, so I simply found another way to send the e-mail, and then sent them a note saying that until they switched ISP's or fixed their mail server to remove the use of the DNSBL, I would refuse to help them with their Linux ext3 problem. :-) But I view DNSBL's as fundamentally the Wrong Answer, and it breaks the intended SMTP and Internet architecture, with fundamentally wrong power dynamics. Of course, if you run a major mail operation, where DNSBL's don't dare block you lest it become obvious that the whole mechanism is corrupt, you don't see these problems. - Ted _______________________________________________ Ietf@xxxxxxxx https://www.ietf.org/mailman/listinfo/ietf