mx03.ctrls.in has no CNAME records.
Question and response
Question
dig mx03.ctrls.in. NS
Answer
The response has no answer records.
Authority
ctrls.in. 4 SOA ns20.ctrls.in. hostmaster.ctrls.in. 2022122301 28800 7200 2419200 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0