inbound01.afxemail.com has no NS records.
NS records for this zone are defined at afxemail.com.
NS records for this zone are defined at afxemail.com.
Question and response
Question
dig inbound01.afxemail.com. NS
Answer
The response has no answer records.
Authority
afxemail.com. 3600 SOA ns1.livedns.co.uk. admin.afxemail.com. 1574332592 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1220, xrcode 0, version 0, flags 0