mx.terashima-clinic.com has no NS records.
NS records for this zone are defined at terashima-clinic.com.
NS records for this zone are defined at terashima-clinic.com.
Question and response
Question
dig mx.terashima-clinic.com. NS
Answer
The response has no answer records.
Authority
terashima-clinic.com. 3600 SOA dns.terashima-clinic.com. hostmaster.terashima-clinic.com. 1655599332 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0