mx1.promail.com.tr has no NS records.
NS records for this zone are defined at promail.com.tr.
NS records for this zone are defined at promail.com.tr.
Question and response
Question
dig mx1.promail.com.tr. NS
Answer
The response has no answer records.
Authority
promail.com.tr. 1800 SOA bob.ns.cloudflare.com. dns.cloudflare.com. 2399029931 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0