How to make a Virtualmin server (Ubuntu) a recursive DNS server
You might want to bring up your own name servers if you want to use Spamhaus that doesn’t like open resolvers like 1.1.1.1 Steps Check
spamhaus
Consolidated List of Pronounced RBLs (Real-time Black Lists) and Experiences in De-Listing
Background Getting your IP address blacklisted as is not fun at all. A simple breach leads to discomfort a few hours, a more serious breach