_spf.cloudezmail.io has no CNAME records.
Question and response
Question
dig _spf.cloudezmail.io. NS
Answer
The response has no answer records.
Authority
cloudezmail.io. 300 SOA ns1.cloudez.io. root.cloudez.io. 1771038219 3600 1800 2419200 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0