smtp-in.me-central2-prod1.cm.net.sap has no NS records.
NS records for this zone are defined at cm.net.sap.
NS records for this zone are defined at cm.net.sap.
Question and response
Question
dig smtp-in.me-central2-prod1.cm.net.sap. NS
Answer
The response has no answer records.
Authority
me-central2-prod1.cm.net.sap. 8468 SOA ns1.sap.net. dns.sap-ag.de. 1765449912 3551 600 3600000 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0