Performance Issues - PTR Records
Leo Vegoda
leo.vegoda at icann.org
Wed Nov 9 19:08:44 UTC 2011
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.
>
> 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.
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.
Regards,
Leo
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