mailservice.eurodns.com has no CNAME records.
Question and response
Question
dig mailservice.eurodns.com. NS
Answer
The response has no answer records.
Authority
eurodns.com. 10800 SOA ns-a.eurodns.com. hostmaster.eurodns.com. 2026030101 43200 7200 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0