node01.secure-mailgate.com has no CNAME records.
Question and response
Question
dig node01.secure-mailgate.com. NS
Answer
The response has no answer records.
Authority
secure-mailgate.com. 1759 SOA cns1.cloudpit.de. hostmaster.dogado.de. 2025120506 86400 1800 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0