I have seen ISPs and hosting proividers reluctant to offer to add PTR records for blocks that they control that point to hosts in domains out of their control. As a result you end up with either no PTR or a PTR that points an IP to a host that isn't relevant or correct as far as what the Internet sees on the host.
On Mon, Mar 3, 2014 at 12:26 PM, Stephen Malone < stephen.mal...@microsoft.com> wrote: > Hi Folks, > > > > For PTR records out there that are pointing to domains other than those > that you control, I'm looking to understand common practice around their > setup. Two questions: > > > > 1. In general, can I trust PTR records? Is ownership of the target > domain validated at setup time by ISPs, and if yes, how is this done? > > 2. If ownership of PTR targets is not routinely validated, is there > a risk that the target domain could be blacklisted by anti-spam providers? > > > > Thanks, > > Stephen Malone > > Microsoft > > ------------------------------ > > About Microsoft Ireland: www.microsoft.com/ireland > Microsoft Ireland Operations Limited. A company incorporated and > registered in Ireland number 256796. > Microsoft Ireland Research. A company incorporated and registered in > Ireland number 342235. > Registered office 70 Sir John Rogerson's Quay, Dublin 2, Ireland > > _______________________________________________ > dns-operations mailing list > dns-operations@lists.dns-oarc.net > https://lists.dns-oarc.net/mailman/listinfo/dns-operations > dns-jobs mailing list > https://lists.dns-oarc.net/mailman/listinfo/dns-jobs > -- Glen Wiley KK4SFV "A designer knows he has achieved perfection not when there is nothing left to add, but when there is nothing left to take away." - Antoine de Saint-Exupery
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