mail01.feeddex.cloud.shockmedia.nl has no CNAME records.
Question and response
Question
dig mail01.feeddex.cloud.shockmedia.nl. NS
Answer
The response has no answer records.
Authority
shockmedia.nl. 1659 SOA ns1.shockmedia.nl. hostmaster.shockmedia.nl. 2026030601 3600 900 1209600 43200
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0