Re: macomnet weird dns record

[William Herrin <bill () herrin us>]

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/>