lsicloud-smtp.letsignit.com has no NS records.
NS records for this zone are defined at letsignit.com.
NS records for this zone are defined at letsignit.com.
Question and response
Question
dig prod-smtp-frc-001.francecentral.cloudapp.azure.com. NS
Answer
The response has no answer records.
Authority
francecentral.cloudapp.azure.com. 60 SOA ns1-06.azure-dns.com. msnhst.microsoft.com. 1 900 300 604800 60
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0