> On Nov 30, 2017, at 1:22 AM, Bjørn Mork <bj...@mork.no> wrote: > > "John Levine" <jo...@iecc.com> writes: > >> Broken rDNS is just broken, since there's approximately no reason ever >> to send from a host that doesn't know its own name. > > rDNS is not a host attribute, and will therefore tell you exactly > nothing about the host.
It tells you something about the competence of the operator and whether the host is intended by the owners to send email. Or, for a more empirical way to look at it, there's reasonable correlation between having missing, generic or incorrect reverse DNS and the host being a source of unwanted or malicious email. Cheers, Steve