12 Apr
2022
12 Apr
'22
10:35 a.m.
Hello,
On Tue, Apr 12, 2022 at 10:04:14AM +0100, Kevin Steen wrote:
It is valid in DNS but there are some cases of mail servers that
don't understand this, and only process the first answer, which is
usually random.
As it is mostly only a cosmetic thing, and there's no issue with
having one host e.g. mail.example.com that also does HELO as
mail.example.com, I do recommend sticking to just one PTR record.
It's just that some people host mail for e.g. foo.com and bar.com
and want no mention at all of bar.com in the records and HELO for
foo.com and vice versa, so they add matching names for everything.
Cheers,
Andy
--
https://bitfolk.com/ -- No-nonsense VPS hosting
On 12/04/2022 08:31, Keith Williams wrote:
> $ORIGIN 35.84.119.85.in-addr.arpa.
This is not the correct zone name, so Keith is serving a completely
different zone to what is being asked for, which is why queries get
a REFUSED answer.
PTR
keynesmail.com <http://keynesmail.com>.
PTR www.keynesmail.com <http://www.keynesmail.com>.
PTR mx10.keynesmail.com <http://mx10.keynesmail.com>.
PTR webmail.keynesmail.com <http://webmail.keynesmail.com>.
I don't think multiple PTR records are valid - there can be only one, which
may be confusing the receiving software.