[179485] in North American Network Operators' Group
Re: macomnet weird dns record
daemon@ATHENA.MIT.EDU (William Herrin)
Tue Apr 14 13:24:18 2015
X-Original-To: nanog@nanog.org
X-Really-To: <nanog@nanog.org>
In-Reply-To: <CALgsdbfiE_DvF-y4WJ1nqXCtnbZJ0w33z4a6x41xb-tS3XeO3w@mail.gmail.com>
From: William Herrin <bill@herrin.us>
Date: Tue, 14 Apr 2015 13:23:49 -0400
To: Pavel Odintsov <pavel.odintsov@gmail.com>
Cc: "nanog@nanog.org" <nanog@nanog.org>
Errors-To: nanog-bounces@nanog.org
On Tue, Apr 14, 2015 at 10:09 AM, Pavel Odintsov
<pavel.odintsov@gmail.com> wrote:
> We use hexademical numbers in PTR for VPS/Servers because PTR's like
> "host-87.118.199.240.domain.ru" so often banned by weird antispam
> systems by mask \d+\.\d+\.\d+\d+ as home ISP subnets which produce
> bunch of spam.
Hi Pavel,
Actually, the anti-spammers figure that only local (authenticated)
computers and other mail servers should talk to their mail servers.
The IP form of RDNS is recognized as a declaration by the service
owner that the computer at that address is not intended to host
Internet services including email. The hex form is viewed the same and
yes, there are antispam products that look for that and a few other
naming structures that imply dynamic IPs are in use. If you want to
run an email server, assign it a name.
Regards,
Bill Herrin
--
William Herrin ................ herrin@dirtside.com bill@herrin.us
Owner, Dirtside Systems ......... Web: <http://www.dirtside.com/>
