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 https://unix.stackexchange.com/questions/371329/bind-proper-reverse-config 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. lhvy93s=@protonmail.com> -- Regards, -- Rui Ribeiro Senior Linux Architect and Network Administrator ISCTE-IUL https://www.linkedin.com/pub/rui-ribeiro/16/ab8/434
