mx3.herosite.pro has no CNAME records.
Question and response
Question
dig mx3.herosite.pro. NS
Answer
The response has no answer records.
Authority
herosite.pro. 10220 SOA ch1.herosite.pro. chinmay.milesweb.com. 2026021601 3600 1800 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0