You define your external DNS lookup servers in the DNS proxy (Proxy --> DNS). If you use your ISP's outbound mail server as a smart host mail forwarder, you can also define it as a host under Definitions --> Networks.
You define your external DNS lookup servers in the DNS proxy (Proxy --> DNS). If you use your ISP's outbound mail server as a smart host mail forwarder, you can also define it as a host under Definitions --> Networks.