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. _______________________________________________ mailop mailing list mailop@mailop.org https://list.mailop.org/listinfo/mailop