[146348] in North American Network Operators' Group
RE: Performance Issues - PTR Records
daemon@ATHENA.MIT.EDU (Leo Vegoda)
Wed Nov 9 14:09:58 2011
From: Leo Vegoda <leo.vegoda@icann.org>
To: Mark Andrews <marka@isc.org>, Jeroen Massar <jeroen@unfix.org>
Date: Wed, 9 Nov 2011 11:08:44 -0800
In-Reply-To: <20111108122731.DF12116E2475@drugs.dv.isc.org>
Cc: "nanog@nanog.org" <nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
Mark Andrew wrote:
[...]
> > That said though the PTR->forward->PTR check is a proper check and a
> > really great way to figure out if the source SMTP host was actually set
> > up with at least some admin doing it the right way. If they can't be
> > bothered to set that up, why should you bother to accept that mail, or =
a
> > better choice, just score it a bit negatively at least.
>=20
> Which only works as a filter because ISP's decided to prevent home
> users from putting valid PTR records in the DNS for their own
> machines. It has nothing to do with clue or knowlege. =20
Some do but some don't. I seem to remember a very nice little web interface=
for setting reverse DNS when I used xs4all's service in the Netherlands.=20
Regards,
Leo
