I have a server configuration that includes Postfix and it is configured to use an external DNS. The domain names involved are configured on the same server but are not live yet (externally they do resolve to their correct OLD IP). Basically we are going to switch externally hosted websites to our server and update name servers.
Performing a ping of one of the domains in question will reveal the correct old IP. However, when postifix attempts to resolve the domain it sees that we have the domains registered on our server and doesn't bother performing a DNS lookup (if it did it would see that they sites actually exist externally).
Is there anyway to force postfix to ignore the locally-created domain names and always perform a DNS looksup until we are ready to 'turn on' (update nameservers) our newly created domains?
Thanks in advance!