Scott Talbert:
> 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.
Sorry, transport mapping happens before DNS lookup. Maybe you can
fix your IPv6 setup by making sure that the PTR record for your
IPv6 address resolves properly: the address->name lookup should
produce a name that resolves to the IPv6 address. Otherwise you
can expect delivery problems.
Wietse
