_spf.mail.hostinger.com has no CNAME records.
Question and response
Question
dig _spf.mail.hostinger.com. NS
Answer
The response has no answer records.
Authority
hostinger.com. 2372 SOA any1.hostinger.com. dns.hostinger.com. 2021102542 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0