mx0.tip.net.au has no CNAME records.
Question and response
Question
dig mx0.tip.net.au. NS
Answer
The response has no answer records.
Authority
tip.net.au. 900 SOA ns1.tip.net.au. hostmaster.tip.net.au. 2025123205 21600 7200 2419200 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0