DNS - Forwarding - Firewall Rule

RouterOS General
1

In the Windows Server DNS settings I configured the forwarders for Google DNS 8.8.8.8 and 8.8.4.4 to try to troubleshoot a name resolution problem for Outlook.
Unfortunately this setting did not work.
I was directed to configure a rule in the Routerbord firewall to accept my internal DNS, how do I configure this rule?

When I use nslookup mydomain.com
Does not resolve the name
But when I use nslookup mydomain.com 8.8.8.8
I have return.

Thank you.

Source: 192.168.4.20 (Internal DNS)
Destination: 8.8.8.8
Port: UDP / 53

2

to forward all your DNS requests to another server you need rule like this

chain=dstnat action=netmap to-addresses=208.67.222.123 protocol=udp dst-port=53