[pfx] Re: Should the configuration upgrade process still append "inet_protocols = ipv4"?

On 2026-05-27 10:50, Wietse Venema via Postfix-users wrote:
> Ralph Seichter via Postfix-users:
>> * Wietse Venema via Postfix-users:
>>> Mel P via Postfix-users:
>>>
>>>> IMHO, that last reinforces the idea that it's time to retire the
>>>> unique handling of inet_protocols, or at least change it to
>>>> "inet_protocols = all"
>>>
>>> That may be so for big providers, but what percentage of Postfix
>>> sites has IPv6 connectivity? Turning on Postfix IPv6 support without
>>> IPv6 connectivity would do no harm for the Postfix SMTP server, but
>>> it would be harmul for the SMTP client.
>>
>> I might be missing something, but how would the SMTP server supporting
>> both IPv4 and IPv6 by default be harmful for the SMTP client? And what
>> is "the" SMTP client in the case you envision?
> 
> Turning on Postfix IPv6 support without IPv6 connectivity would do
> no harm for the Postfix SMTP server.
> 
> Turning on Postfix IPv6 support without IPv6 connectivity would be
> harmul for the Postfix SMTP client.

IME worst case there's a few seconds delay when there's a partial 
network outage, but fallback is otherwise reliably seamless and 
instantaneous.
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