An email server in a residential setting will fail PTR unless you are
working with a medium sized/an ISP that cares about their customers.
see answer here
On 9 August 2017 at 23:34, Rupert Gallagher <r...@protonmail.com> wrote:
> The dns still fails RFC1912 (ptr).
> Sent from ProtonMail Mobile
> On Wed, Aug 9, 2017 at 6:39 PM, Walter Alejandro Iglesias <
> w...@roquesor.com> wrote:
> > Hello Rupert, In article you wrote: > https://www.dnsinspect.com/
> roquesor.com/10171765 Try the link again. The reason it showed false
> results was because dnsinspect.com IP was blocked in my pf firewall. I
> have a script to detect hacking attempts in my port 25 and block those IPs
> automatically. Thanks for your help anyways. And sorry if I didn't answer
> you before. firstname.lastname@example.org>
Senior Linux Architect and Network Administrator