Using my domain, riowing.net, on DNS domains.google.com as example.

Here are some output of nslookup:

nslookup.exe tech.riowing.net
Server: resolver1.opendns.com. DNS used since we didn’t explicitly say which one to use
“Non-authoritative answer” because tech.riowing.net is not directly on this server
Address: this is the IP returned for tech.riowing.net
To get rid of the word “Non-authoritative”, we do:
nslookup.exe tech.riowing.net ns-cloud-c1.googledomains.com

nslookup.exe -qt=mx riowing.net
riowing.net MX preference = 10, mail exchanger = riowing.net
Therefore, emails to me@riowing.net go to host riowing.net, which is also my email server name.

“Registered hosts” or “glue records” is to avoid loop when name server used is subdomain, e.g. dns.riowing.net. I don’t need this since I use Google Domains nameservers instead of my own, e.g. ns-cloud-c1.googledomains.com

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