mail-en-sender01g.prod.mail.kommosrv.com has no NS records.
NS records for this zone are defined at mail.kommosrv.com.
NS records for this zone are defined at mail.kommosrv.com.
Question and response
Question
dig mail-en-sender01g.prod.mail.kommosrv.com. NS
Answer
The response has no answer records.
Authority
mail.kommosrv.com. 600 SOA ns3.kommosrv.com. admin.amosrv.ru. 1774016772 604800 86400 2419200 604800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0