mail.intelliworxit.com has no NS records.
NS records for this zone are defined at intelliworxit.com.
NS records for this zone are defined at intelliworxit.com.
Question and response
Question
dig mail.intelliworxit.com. NS
Answer
The response has no answer records.
Authority
intelliworxit.com. 900 SOA ns-608.awsdns-12.net. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0