On Tue, Jul 21, 2020 at 02:09:04PM -0400, Wietse Venema 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.
>
> If 2/3 of all SMTP clients are IPv4-only, then that would be a reason
> not to make this the default for SMTP.
My server accepts email overs IPv6. Outbound, I don't presently enable
IPv6 by default, largely because operators like Google decided it would
be a good idea to erect higher barriers when receiving email over IPv6.
The result has largely been to slow IPv6 adoption in SMTP, rather than
senders rushing out to jump through all the new hoops.
--
VIktor.
