Why hasn't anyone mentioned the mythic-beasts.com stuff being potentially
problematic? The host name, A record, mx record, ptr record are all
mythic-beast.com. If Google doesn't like them, all this stuff you're doing
is a moot point.

On Sat, Nov 21, 2020, 6:49 AM Jim Popovitch via mailop <mailop@mailop.org>
wrote:

> 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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