[FOSDEM] [IPv6] FOSDEM mail servers

Damian Zaremba damian at damianzaremba.co.uk
Mon Feb 3 12:27:10 CET 2014


Hi All,

Since we had a totally IPv6 network, I'd just like to point out the 
fosdem.org mail servers seem broken for accepting mail over ipv6.

Only one server has a v6 address and is not listening on port 25 (the v4 
address is), happened to notice looking at my mail server logs :)

2014-02-03 11:02:13 1WAHHx-00074w-9K episteme.fosdem.org 
[2a01:4f8:191:4332::28] Connection refused

damian at Capricorn:~$ dig +short fosdem.org mx
20 episteme.fosdem.org.
10 apeiron.fosdem.org.

damian at Capricorn:~$ dig +short episteme.fosdem.org ANY
85.10.228.28
2a01:4f8:191:4332::28

damian at Capricorn:~$ dig +short apeiron.fosdem.org ANY
82.146.116.115


IPv4 ok:
damian at Capricorn:~$ telnet apeiron.fosdem.org 25
Trying 82.146.116.115...
Connected to apeiron.fosdem.org.
Escape character is '^]'.
220 apeiron.fosdem.org ESMTP Postfix
^]quit

telnet> quit
Connection closed.

damian at Capricorn:~$ telnet episteme.fosdem.org 25
Trying 85.10.228.28...
Connected to episteme.fosdem.org.
Escape character is '^]'.
220 episteme.fosdem.org ESMTP Postfix
^]quit

telnet> quit
Connection closed.

IPv6 not:
web1-man:~# telnet episteme.fosdem.org 25
Trying 2a01:4f8:191:4332::28...
Trying 85.10.228.28...
Connected to episteme.fosdem.org.
Escape character is '^]'.
220 episteme.fosdem.org ESMTP Postfix
^]quit

telnet> quit
Connection closed.

(Fails over to v4)

web1-man:~# telnet 2a01:4f8:191:4332::28 25
Trying 2a01:4f8:191:4332::28...
telnet: Unable to connect to remote host: Connection refused

:(

Would be good to get this resolved so mail can be received over V6!

Cheers

- Damian


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