mx2.ha-vel.cz has no CNAME records.
Question and response
Question
dig mx2.ha-vel.cz. NS
Answer
The response has no answer records.
Authority
ha-vel.cz. 1195 SOA ns.ha-vel.cz. hostmaster.ha-vel.cz. 2026030611 14400 3600 1814400 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0