There has been some debate in this forum on whether DNSxLs are an appropriate tools for stopping spam. Whether or not IP-based blocking is a philosophically appropriate method to use, every large scale ISP uses these lists as a first line defense against spam. DNSxLs are a much-used and effective tool in preventing the delivery of spam to the inbox and should be standardized to reduce the cost of implementation of anti-spam measures. The draft outlines the structure and functionality of DNSxLs, but does not dictate or require the use of them. Moreover, it is not the role of this draft to outline the policies for DNSxL listings and procedures for list management. We at Cloudmark support draft-irtf-asrg-dnsbl-07 on the Standards Track and believe that standardization of DNSxL queries and response codes eliminates confusion, eases tool writing, aids email administrators, and reduces everyone's mail infrastructure operating cost. --- Jamie Tomasello Abuse Operations Manager Cloudmark, Inc. _______________________________________________ Ietf@xxxxxxxx https://www.ietf.org/mailman/listinfo/ietf