Hello, New to Postfix here.
Unfortunately Google has stopped accepting mail from my server via IPv6 and I haven't been able to figure out why or resolve the problem. However, it accepts mail via IPv4 just fine. Thus, I would like to configure Postfix to use IPv4 when sending mail to Google. I can see that this is posible by destination domain using transport_maps. So, I could use transport_maps to specify that all mail to @gmail.com would be sent via IPv4. However, there are many other domains that use Google's email services. Rather than try to list all of them, I was wondering if instead it was possible to force IPv4 by destination MX instead. In that case, I could just specify all of Google's MX's and work around this problem.
Thanks, Scott
