On Sat, 2020-11-21 at 13:59 +0100, Thomas Walter via mailop wrote:
> Hello,
>
> On 21.11.20 12:54, Jaroslaw Rafa via mailop wrote:
> > You can configure your MTA to disable IPv6 only for delivery to Google - at
> > least with Postfix it should be possible.
>
> how would one do that?
With a custom transport table and a custom master.cf entry.
> We don't know all domains that sue Google MXs, we don't know all MXs
> Google uses and they might change. Do we know Google's IPv6 addresses?
> Do those change?
It's done by destination domain, not IP address.
Here's the relevant transport table entries of domains that I enforce
IPv4 delivery to:
gmail.com smtp-v4:
google.com smtp-v4:
googleemail.com smtp-v4:
hotmail.com smtp-v4:
live.com smtp-v4:
outlook.com smtp-v4:
microsoft.com smtp-v4:
msn.com smtp-v4:
yahoo.com smtp-v4:
yahoo.com.mx smtp-v4:
yahoo.co.uk smtp-v4:
yahoo.es smtp-v4:
yahoo.com.br smtp-v4:
yahoo.co.in smtp-v4:
sbcglobal.net smtp-v4:
sky.com smtp-v4:
rocketmail.com smtp-v4:
aol.com smtp-v4:
Here's the relevant master.cf entry:
# ipv4-only outbound
smtp-v4 unix - - y - 200 smtp
-o inet_protocols=ipv4
...
-Jim P.
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