On Mon, Jan 08, 2024 at 04:02:48PM +0100, Michael Grimm via Postfix-users wrote:
> Sometimes outgoing mail is deferred due to "reputational issues" at
> the receiving side. These "reputational issues" mostly concerned my
> IP6 addresses, thus I removed IP6 mailing completely. But now, I do
> want to give it a try, again.
>
> In the past, whenever a mail has been deferred, I manually modified
> inet_protocols to the protocol *not* involved, restarted postfix and
> ran 'postqueue -f'. After having the "reputational issue" solved, I
> returned to inet_protocols=all.
You shouldn't need anything nearly so complex.
I have in master.cf:
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
Of course, as noted by Wietse, when MX-hosts for a myriad (not possible
to explicitly list) domains need a specific transport, the DNS reply
filter comes in handy. Between that, and explicit transports you should
be able to have IPv4+IPv6 as a default with appropriate work-arounds.
Or perhaps IPv4 as a default, with IPv6 or both for domains where those
work better.
--
Viktor.
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