spfa.cpmails.com has no NS records.
NS records for this zone are defined at cpmails.com.
NS records for this zone are defined at cpmails.com.
Question and response
Question
dig spfa.cpmails.com. NS
Answer
The response has no answer records.
Authority
cpmails.com. 900 SOA ns-540.awsdns-03.net. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0