https://writemyessay.onlYou need to go to the DNS Server settings, select Properties and on the Interfaces tab, explicitly select only those addresses to which you want to accept dns requests.
Is this possible in OPNSense? With the advent of DoH I want to prevent all connections to IPs that have not been resolved by the local DNS cache.I looked through the settings and I didn't see anything that would do this.Thanks.
This sounds like a problem for Zenarmor (sensei) to solve, not for opnsense. You should ask them if they can or have plans to do this.