SMTP & IPv6

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I just noticed that two colleagues of mine have IPv6-accesssible SMTP systems. One is at PSC, the other at SWITCH (who also has v6-accessible authoritative DNS :).

I sent both of them test emails and confirmed that ET's SMTP server does use IPv6 preferentially over IPv4. It's nice to see a (small) part of the Internet's mail infrastructure switching over to IPv6.


$ dig -t MX psc.edu

; <<>> DiG 9.3.4 <<>> -t MX psc.edu
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 56239
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 3, ADDITIONAL: 5

;; QUESTION SECTION:
;psc.edu. IN MX

;; ANSWER SECTION:
psc.edu. 172226 IN MX 20 mailer2.psc.edu.
psc.edu. 172226 IN MX 20 mailer1.psc.edu.

;; AUTHORITY SECTION:
psc.edu. 104552 IN NS dns2.itd.umich.edu.
psc.edu. 104552 IN NS charon.psc.edu.
psc.edu. 104552 IN NS dns1.psc.edu.

;; ADDITIONAL SECTION:
mailer1.psc.edu. 172153 IN A 128.182.58.100
mailer1.psc.edu. 172153 IN AAAA 2001:5e8:1:3a::64
mailer2.psc.edu. 172153 IN A 128.182.66.106
dns1.psc.edu. 104552 IN A 128.182.58.105
charon.psc.edu. 104552 IN A 128.182.65.6

;; Query time: 2 msec
;; SERVER: 2610:8:6800:1::4#53(2610:8:6800:1::4)
;; WHEN: Tue Nov 27 10:01:05 2007
;; MSG SIZE rcvd: 234

$ dig -t MX switch.ch

; <<>> DiG 9.3.4 <<>> -t MX switch.ch
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 21949
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 2, ADDITIONAL: 13

;; QUESTION SECTION:
;switch.ch. IN MX

;; ANSWER SECTION:
switch.ch. 86400 IN MX 10 medel.switch.ch.
switch.ch. 86400 IN MX 10 aletsch.switch.ch.

;; AUTHORITY SECTION:
switch.ch. 143509 IN NS merapi.switch.ch.
switch.ch. 143509 IN NS scsnms.switch.ch.

;; ADDITIONAL SECTION:
medel.switch.ch. 300 IN A 130.59.108.38
medel.switch.ch. 300 IN A 130.59.108.39
medel.switch.ch. 300 IN AAAA 2001:620::14:214:4fff:fe75:4774
medel.switch.ch. 300 IN AAAA 2001:620::14:214:4fff:fe75:4775
aletsch.switch.ch. 300 IN A 130.59.138.26
aletsch.switch.ch. 300 IN A 130.59.138.27
aletsch.switch.ch. 300 IN AAAA 2001:620::1b:203:baff:febe:9059
aletsch.switch.ch. 300 IN AAAA 2001:620::1b:203:baff:febe:905a
merapi.switch.ch. 68848 IN A 130.59.211.10
merapi.switch.ch. 68848 IN AAAA 2001:620::5
scsnms.switch.ch. 81739 IN A 130.59.10.30
scsnms.switch.ch. 81739 IN A 130.59.1.30
scsnms.switch.ch. 81739 IN AAAA 2001:620::1

;; Query time: 116 msec
;; SERVER: 2610:8:6800:1::4#53(2610:8:6800:1::4)
;; WHEN: Tue Nov 27 10:01:16 2007
;; MSG SIZE rcvd: 395

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