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