mx01.secure-mail-gateway.com has no NS records.
NS records for this zone are defined at secure-mail-gateway.com.
NS records for this zone are defined at secure-mail-gateway.com.
Question and response
Question
dig mx01.secure-mail-gateway.com. NS
Answer
The response has no answer records.
Authority
secure-mail-gateway.com. 300 SOA ns1.portformance.com. hostmaster.portformance.de. 2024061000 43200 7200 1209600 300
Additional
. 0 OPT ; payload 1220, xrcode 0, version 0, flags 0