mx.myomnitel.com has no NS records.
NS records for this zone are defined at myomnitel.com.
NS records for this zone are defined at myomnitel.com.
Question and response
Question
dig mx.myomnitel.com. NS
Answer
The response has no answer records.
Authority
myomnitel.com. 600 SOA ns1.ispn.net. servers.ispn.net. 2026021700 3600 600 1209600 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0