Unused IP addresses are also not problematic. My only point was this: if the IPv6 address space is too large for blacklists or other reputation management tools, then the domain address space is very much larger. There’s always another address you can register.
> On 17 Mar 2015, at 13:45, David Hofstee <da...@mailplus.nl> wrote: > > DMARC does not validate on domain names that are not registered... So I'm not > sure that is a problem. Subdomains are solved for DMARC too (it will default > to the organizational domain name if no subdomain-DMARC setting is present; > max. of 2 queries). > > Recent domain registration date is used already, quite frequently I might add > (http://support-intelligence.com/dob/). And you might add reputation on the > registrar and/or nameserver(s) domains. > > > David Hofstee > > Deliverability Management > MailPlus B.V. Netherlands (ESP) > > > -----Oorspronkelijk bericht----- > Van: mailop [mailto:mailop-boun...@mailop.org] Namens Ian Eiloart > Verzonden: Tuesday, March 17, 2015 2:22 PM > Aan: mailop@mailop.org > Onderwerp: Re: [mailop] Help. Why are my emails being marked as spam by > google? > > >> On 17 Mar 2015, at 12:13, David Hofstee <da...@mailplus.nl> wrote: >> >>> Um, how does the number of available domains compare with the number of >>> available IP addresses? >> >> Pretty good actually, comparable to IPv4. And they are harder to get, I >> think (there is always a money trail): >> https://www.quora.com/What-is-the-total-number-of-domains-in-the-world >> -gTLDs-+-ccTLDs-+-IDNs?share=1 >> http://onlinedomain.com/2015/03/13/news/new-gtlds-dont-have-a-major-im >> pact-on-phishing-yet-85-of-phishing-domain-names-were-registered-in-ch >> ina/ > > That refers to registered domains, I think. What I had in mind was the size > of the name space. It’s vastly larger, surely? IPv6 is 2^128 (3.4x10^38), > whereas in any TLD, there are about 37^63 (6.2x10^98 or 2^328). And that’s > before you get to any subdomains: which are rather easier to obtain. > > Easy to obtain, I suppose that depends on the registrar. Which is why it > might be useful to have a reputation tool based on registrar. I think some > already look for recent registrations. > > -- > Ian Eiloart > Postmaster, University of Sussex > +44 (0) 1273 87-3148 > > _______________________________________________ > mailop mailing list > mailop@mailop.org > http://chilli.nosignal.org/mailman/listinfo/mailop > _______________________________________________ > mailop mailing list > mailop@mailop.org > http://chilli.nosignal.org/mailman/listinfo/mailop -- Ian Eiloart Postmaster, University of Sussex +44 (0) 1273 87-3148 _______________________________________________ mailop mailing list mailop@mailop.org http://chilli.nosignal.org/mailman/listinfo/mailop
