spf.mailhy.com has no CNAME records.
Question and response
Question
dig spf.mailhy.com. NS
Answer
The response has no answer records.
Authority
mailhy.com. 10800 SOA ns1.mailhy.com. Postmaster.mailhy.com. 343569443 10800 3600 172800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0