_spf1.diabolocom.com has no CNAME records.
Question and response
Question
dig _spf1.diabolocom.com. NS
Answer
The response has no answer records.
Authority
diabolocom.com. 656 SOA nsa01.corp.dblc.io. hostmaster.diabolocom.com. 2026022402 1200 1200 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0