mta.tanomail.com has no NS records.
NS records for this zone are defined at tanomail.com.
NS records for this zone are defined at tanomail.com.
Question and response
Question
dig mta.tanomail.com. NS
Answer
The response has no answer records.
Authority
tanomail.com. 1800 SOA ns2.otsuka-shokai.co.jp. root.otsuka-shokai.co.jp. 2025121501 10800 3600 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0