Hi, On Thu, May 23, 2019 at 08:18:22PM -0600, Keith Medcalf wrote:

What is a "strong PTR"?

Poor wording on my side. This should have been "strong PTR requirements", like "you must have one", "it must match forward" and, I think, "it should be something that looks like a algorithmically-mapped address". Which is all good practice anyway, so this annoys me less than the *difference* between their v4 and v6 requirements, and that the v6 requirements are not always easy to understand - like, you get an error about your PTRs, but they are all there and symmetric... gert -- "If was one thing all people took for granted, was conviction that if you feed honest figures into a computer, honest figures come out. Never doubted it myself till I met a computer with a sense of humor." Robert A. Heinlein, The Moon is a Harsh Mistress Gert Doering - Munich, Germany gert@greenie.muc.de