Re: [exim] Subtle delivery issue - BROKEN DNS PTR questions.

On Tue, 2012-04-03 at 08:46 -0700, Todd Lyons wrote:
> On Tue, Apr 3, 2012 at 7:51 AM, exim.ml@??? <exim.ml@???> wrote:
> >> > The host concerned has a PTR record, it's a bit of a mess, but it's
> >> > there:
> >> > dig -x 205.134.224.208
> >> >
> >> > 208.224.134.205.in-addr.arpa. 17019 IN CNAME
> >> > 208.128-255.224.134.205.in-addr.arpa.
> >> > 208.128-255.224.134.205.in-addr.arpa. 65020 IN PTR
> >> > whub28.webhostinghub.com.
> >>
> >> SOP for doing rDNS for non 8 bit boundaries.
> > I'm sorry Todd, I don't understand that?
>
> SOP means Standard Operating Practice, sorry if the acronym didn't
> translate well.
>
> When delegating reverse dns to a company, say for example our
> 64.14.201.0/24 assignment, the registrar can very simply point
> 201.14.64.in-addr.arpa to our nameservers because it's on an 8 bit
> boundary.

Now that makes perfect sense! It's obvious now you say it, I can see
exactly why it's done. Penny drops in a bit of a Eureaka moment.

Thank you Todd. Really useful info.

Ron