theaccessgroupspf.smtp.com has no NS records.
NS records for this zone are defined at smtp.com.
NS records for this zone are defined at smtp.com.
Question and response
Question
dig theaccessgroupspf.smtp.com. NS
Answer
The response has no answer records.
Authority
smtp.com. 900 SOA ns-1304.awsdns-35.org. awsdns-hostmaster.amazon.com. 2 7200 900 1209600 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0