Greetings everyone,
In 2020 we think it would be a reasonable enable IPv6 it by default.
V4 addresses are getting expensive, and new ISP-s and businesses are
moving to V6 with great momentum. Moreover it would help us and others
to reduce complexity in their infrastructure.
The postfix IPv6 article(1) mentions a couple points against this, but
the followings are not valid anymore in 2020:
"By default, Postfix uses IPv4 only, because most systems aren't
attached to an IPv6 network."
According to Google, third of their users access their service via IPv6.
"Linux kernels don't even load IPv6 protocol support by default. Any
attempt to use it would fail immediately."
It is enabled by default(3).
The change:
/etc/postfix/main.cf:
from: inet_protocols = ipv4 (DEFAULT: enable IPv4 only)
to: inet_protocols = all (DEFAULT: enable IPv4, and IPv6 if
supported)
Looking forward to hear your thoughts.
Best,
Balazs
1: http://www.postfix.org/IPV6_README.html
2: https://www.google.com/intl/en/ipv6/statistics.html
3: https://www.kernel.org/doc/Documentation/networking
