sdn166.mailxmgses.com has no NS records.
NS records for this zone are defined at mailxmgses.com.
NS records for this zone are defined at mailxmgses.com.
Question and response
Question
dig sdn166.mailxmgses.com. NS
Answer
The response has no answer records.
Authority
mailxmgses.com. 900 SOA ns-1667.awsdns-16.co.uk. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0