I’m on version 2026-07a and under an admin login, when going to System -> Information and clicking the “Show Public IP” button - only the IPv4 reliably appears. Sometimes IPv6 will appear and sometimes it will just show a “-”
Regardless of the IP appearing, mailcow is responding to port 25 on it’s IPv6 address.
Is this a known issue or what could be causing this?
Initially I thought something was wrong with my IPv6 from my ISP but after realizing it’s pinging, and repsonding to port 25 requests it just appears to be a informational glitch in the GUI perhaps?
Thanks
ping ipv6.mailcow.email
PING ipv6.mailcow.email (2a01:4f8:c17:7906::10) 56 data bytes
— ipv6.mailcow.email ping statistics —
5 packets transmitted, 0 received, 100% packet loss, time 4079ms
mail2:~$ ping ipv6.google.com
PING ipv6.google.com (2607:f8b0:4009:812::200e) 56 data bytes
64 bytes from ncorda-aq-in-x0e.1e100.net (2607:f8b0:4009:812::200e): icmp_seq=1 ttl=116 time=11.8 ms
64 bytes from ncorda-aq-in-x0e.1e100.net (2607:f8b0:4009:812::200e): icmp_seq=2 ttl=116 time=12.5 ms
64 bytes from ncorda-aq-in-x0e.1e100.net (2607:f8b0:4009:812::200e): icmp_seq=3 ttl=116 time=12.0 ms
64 bytes from ncorda-aq-in-x0e.1e100.net (2607:f8b0:4009:812::200e): icmp_seq=4 ttl=116 time=12.1 ms
C
— ipv6.google.com ping statistics —
4 packets transmitted, 4 received, 0% packet loss, time 3005ms
rtt min/avg/max/mdev = 11.786/12.104/12.501/0.256 ms
Traceroute to ipv6.mailcow.email
ix-bundle-19.qcore1.ct8-chicago.ipv6.as6453.net (2001:5a0:1100::e) 23.046 ms * *
10 * * *
11 * * *
12 * * *
13 if-bundle-8-2.qcore2.av2-amsterdam.ipv6.as6453.net (2a01:3e0:ff40:20::6) 103.504 ms * *
14 if-bundle-9-2.qcore1.fnm-frankfurt.ipv6.as6453.net (2a01:3e0:ff40:20::25) 107.412 ms * 107.598 ms
15 * if-bundle-9-2.qcore1.fnm-frankfurt.ipv6.as6453.net (2a01:3e0:ff40:20::25) 107.364 ms if-bundle-67-2.qcore2.fr0-frankfurt.ipv6.as6453.net (2a01:3e0:ff00::115) 107.619 ms
16 * * *
17 if-be-25-2.ecore1.fr0-frankfurt.ipv6.as6453.net (2a01:3e0:ff20:400::25) 107.615 ms 2a01:3e0:ff20:410::a (2a01:3e0:ff20:410::a) 107.165 ms if-be-25-2.ecore1.fr0-frankfurt.ipv6.as6453.net (2a01:3e0:ff20:400::25) 107.385 ms
18 if-be-25-2.ecore1.fr0-frankfurt.ipv6.as6453.net (2a01:3e0:ff20:400::25) 107.739 ms 2a01:3e0:ff20:410::a (2a01:3e0:ff20:410::a) 112.505 ms *
19 * * *
20 * * *
21 * * *
22 * * *
23 * * *
it seems like Hetzner is the destination where this check occurs, and it’s blocking IPv6 traffic at least from my ISP… seems to be just cosmetic but wonder if it’s a larger issue.