On 21.07.2020 19:37, Bill Cole wrote:
"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.
So, Google agrees with the Postfix docs, correct?
Based on occasional issues raised here, it appears that some
distributions package Postfix with IPv6 enabled, resulting in issues for
people in the common circumstance of having IPv6 enabled in their OS and
doing some sort of autoconfig without connectivity to the global IPv6
Internet. I don't believe that we've ever had someone come here with an
actual problem rooted in Postfix not enabling IPv6 by default. Do you
have such a problem or is your concern purely on principle?
My personal opinion is that Postfix should be IPv6-enabled by default
when one will enable IPv6 in real dualstack systems more often than to
disable IPv6 in IPv4-only ones. My personal statistics is about 20:1
ratio of no-IPv6 servers/VMs vs. two mail hubs with real IPv6 connection.
That means I would have to turn IPv6 off 20 times more often (if Postfix
would have IPv6 by default enabled) than turning it on for mailhub (if
situation persists). My conclusion: its too early.
--
Sincerely yours,
Dima Veselov
Physics R&D Establishment of Saint-Petersburg University
