Yes some already block/timeout with the 2nd lookup. But there is a flip side. There are dns blacklists that have domainnames that are currently being abused.
> > I hadn't considered being blocked by the TLD's from doing the lookups. > Good point. We probably do about 2K per day so not sure that is enough > to be blocked but it certainly could be. > > > > > >> > >> Why would it have to have to be specific per TLD? Why I have in > mind is > >> looking at the creation date of the sending domain and scoring it up > if > >> it is newer than 12 months, no matter what the TLD is. > > > >I totally get it. I was thinking of incorporating this in a service for > a European project. And even going further, querying owner information. > > > >> Am I missing something? > > > >Because this information is only available at tld's and just querying > the whois endlessly will be blocked. Every tld registry has their own > operating rules.
