smtp01.d2ms.com has no NS records.
NS records for this zone are defined at d2ms.com.
NS records for this zone are defined at d2ms.com.
Question and response
Question
dig smtp01.d2ms.com. NS
Answer
The response has no answer records.
Authority
d2ms.com. 3600 SOA ns1-06.azure-dns.com. hostmaster.webd2ms.com. 243 2400 600 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0