mx.tukilost.com has no NS records.
NS records for this zone are defined at tukilost.com.
NS records for this zone are defined at tukilost.com.
Question and response
Question
dig mx.tukilost.com. NS
Answer
The response has no answer records.
Authority
tukilost.com. 3600 SOA dns.tukilost.com. hostmaster.tukilost.com. 1529057077 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0