mailx2.integralsupport.com has no NS records.
NS records for this zone are defined at integralsupport.com.
NS records for this zone are defined at integralsupport.com.
Question and response
Question
dig mailx2.integralsupport.com. NS
Answer
The response has no answer records.
Authority
integralsupport.com. 900 SOA ns-1130.awsdns-13.org. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0