_spf.coaction.com has no CNAME records.
Question and response
Question
dig _spf.coaction.com. NS
Answer
The response has no answer records.
Authority
coaction.com. 3216 SOA ns2.tierra.net. hostmaster.tierra.net. 2024021301 10800 900 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0