9 Nov
2011
9 Nov
'11
7:08 p.m.
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