smtp01.mhg.thalesgroup.com has no NS records.
NS records for this zone are defined at thalesgroup.com.
NS records for this zone are defined at thalesgroup.com.
Question and response
Question
dig smtp01.mhg.thalesgroup.com. NS
Answer
The response has no answer records.
Authority
thalesgroup.com. 900 SOA ns1.thalesgroup.com. operateur-dns.thalesgroup.com. 2026031729 21600 3600 3600000 900
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0