mailrelayus2.kubra.com has no NS records.
NS records for this zone are defined at kubra.com.
NS records for this zone are defined at kubra.com.
Question and response
Question
dig mailrelayus2.kubra.com. NS
Answer
The response has no answer records.
Authority
kubra.com. 3600 SOA pdns112.ultradns.com. admin.kubra.com. 2023057497 3600 900 604800 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0