mail.nesteshipping.com has no CNAME records.
Question and response
Question
dig mail.nesteshipping.com. NS
Answer
The response has no answer records.
Authority
nesteshipping.com. 1268 SOA ns.nesteoil.com. hostmaster.plat.fi. 2025080101 7200 1800 2419200 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0