In message <41f6c547ea49ec46b4ee1eb2bc2f341849f82d4...@exvpmbx100-1.exc.icann.o rg>, Leo Vegoda writes: > 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
But many do. As I said the ability to set up PTR records has *nothing* to do with the clue level of the administrator. It has everything to do with what the ISP will let you do. Mark -- Mark Andrews, ISC 1 Seymour St., Dundas Valley, NSW 2117, Australia PHONE: +61 2 9871 4742 INTERNET: ma...@isc.org
