vmail.zone.eu has no CNAME records.
Question and response
Question
dig vmail.zone.eu. NS
Answer
The response has no answer records.
Authority
zone.eu. 3600 SOA ns.zone.eu. hostmaster.zone.eu. 2026030320 10800 3600 2419200 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0