mailgw.mikrotik.com has no NS records.
NS records for this zone are defined at mikrotik.com.
NS records for this zone are defined at mikrotik.com.
Question and response
Question
dig mailgw.mikrotik.com. NS
Answer
The response has no answer records.
Authority
mikrotik.com. 3600 SOA dns-master.mikrotik.com. support.mikrotik.com. 1773870051 3600 900 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0