mx1.hostinger.mx has no CNAME records.
Question and response
Question
dig mx1.hostinger.mx. NS
Answer
The response has no answer records.
Authority
hostinger.mx. 29 SOA any1.hostinger.com. dns.hostinger.com. 2021102510 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0