30 Nov
2017
30 Nov
'17
12:03 p.m.
On Nov 30, 2017, at 1:22 AM, Bjørn Mork <bjorn@mork.no> wrote:
"John Levine" <johnl@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