spf-d.codero.com has no CNAME records.
Question and response
Question
dig spf-d.codero.com. NS
Answer
The response has no answer records.
Authority
codero.com. 5905 SOA ns1.codero.com. hostmaster.codero.com. 2026021703 14400 3600 1209600 46200
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0