On Fri, 4 Apr 2008, Arnt Gulbrandsen wrote: > Michael Storz writes: > > - number of MTAs from which we accepted emails over IPv6: 255 > > Perhaps you could take the email addresses sent to you by those MTAs and > see how many have MX records, how many only A and how many only AAAA? > > Arnt >
Ok, I've done that. It took some time and I don't know if it is helpful. >From the 255 MTAs, I got emails with 504 different domains in 'mail from' (I excluded the outgoing servers of the german ISP freenet.de, because it would distort the statistik). 160 domains have a path back over IPv6, 155 via MX RRs and 5 via A/AAAA RRs only: ok: art.wga.hu -A-> 148.6.0.90 -PTR-> art.wga.hu no: -PTR-> www.hung-art.hu -A-> 148.6.0.90 ok: -AAAA-> 2001:738:5001:0:0:0:0:90 -PTR-> art.wga.hu no: -PTR-> www.hung-art.hu -AAAA-> 2001:738:5001:0:0:0:0:90 no: mail.imc.org -A-> 192.245.12.227 -PTR-> Balder-227.Proper.COM -A-> 192.245.12.227 no: -AAAA-> 2001:470:1F04:392:0:0:0:2 -PTR-> properopus-pt.tunnel.tserv3.fmt2.ipv6.he.net -AAAA-> NXDOMAIN ok: mail.utef.cvut.cz -A-> 147.32.68.12 -PTR-> mail.utef.cvut.cz ok: -AAAA-> 2001:718:2:2600:0:0:0:3 -PTR-> mail.utef.cvut.cz no: mailman.teg-ev.de -A-> 193.99.159.73 -PTR-> teg.v-pe.de -A-> 193.99.159.73 no: -AAAA-> 2001:600:1003:1:0:0:0:73 -PTR-> teg.v-pe.de -AAAA-> 2001:600:1003:1:0:0:0:73 ok: s5.stud.ku.dk -A-> 130.225.126.137 -PTR-> s5.stud.ku.dk ok: -AAAA-> 2001:878:100:12:0:0:0:137 -PTR-> s5.stud.ku.dk 3 of them are the email servers of their domain without host subdomain: % dig +short imc.org mx 5 mail.imc.org. % dig +short utef.cvut.cz mx 10 regulus.utef.cvut.cz. % dig +short regulus.utef.cvut.cz AAAA mail.utef.cvut.cz. 2001:718:2:2600::3 % dig +short teg-ev.de mx 0 mail.teg-ev.de. % dig +short mail.teg-ev.de AAAA 2001:600:1003:1::73 >From the 155 MX RRs - 58 MX RRs, where all hosts have A + AAAA RRs - 44 MX RRs, which point to one host which has A + AAAA RRs - 43 MX RRs, where at least one of the backup MX has only A RRs, all others with A and AAAA RRs - 5 MX RRs, where the primary has only A RRs, but backup has A and AAAA RRs - 5 MX RRs with mixed hosts, same prio but some have only A RRs other both - 0 MX where one of the hosts has only an AAAA RR, which means prioritizing a protocol is not used and - 3 of the MX point to themselves, which means the domains are hosts with MX RRs. Michael Storz
