mx3.ha-vel.eu has no CNAME records.
Question and response
Question
dig mx3.ha-vel.eu. NS
Answer
The response has no answer records.
Authority
ha-vel.eu. 3600 SOA ns.ha-vel.cz. hostmaster.ha-vel.cz. 2026030601 10800 3600 1814400 43200
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0