mx2.hostinger.es has no CNAME records.
Question and response
Question
dig mx2.hostinger.es. NS
Answer
The response has no answer records.
Authority
hostinger.es. 3575 SOA any1.hostinger.com. dns.hostinger.com. 2021102510 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0