Incoming SMTP in the year 2017 and absence of DKIM
steve at blighty.com
Thu Nov 30 17:03:24 CST 2017
> On Nov 30, 2017, at 1:22 AM, Bjørn Mork <bjorn at mork.no> wrote:
> "John Levine" <johnl at 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.
More information about the NANOG