On Mon, Jan 08, 2024 at 07:36:37PM +0100, Michael Grimm via Postfix-users wrote:
> > smtp unix - - n - - smtp
> > smtpv4 unix - - n - - smtp
> > -o inet_protocols=ipv4
> > smtpv6 unix - - n - - smtp
> > -o inet_protocols=ipv6
> >
> > For destination domains found to have issues with IPv6 (or conversely
> > with IPv4) just specify one of the alternative transports.
> >
> > gmail.com smtpv4:gmail.com
> > example.com smtpv6:example.com
>
> Thanks, this is a good solution in my case, especially due to the fact, that
> those "reputational issues" are not that very often to solve.
>
> But will that work, once a mail has been deferred and is sitting in the queue
> already?
> Meaning, if a 'postqueue -f' will retry with smtpv4, instead sticking to the
> old IPv4 address?
Transport resolution is not "sticky", it is performed de novo, each time
a message enters the active queue.
--
Viktor.
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