mx.gokcag.com has no NS records.
NS records for this zone are defined at gokcag.com.
NS records for this zone are defined at gokcag.com.
Question and response
Question
dig mx.gokcag.com. NS
Answer
The response has no answer records.
Authority
gokcag.com. 3600 SOA dns.gokcag.com. hostmaster.gokcag.com. 1198873304 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0