cz.ns.ua has no MX records.
Question and response
Question
dig cz.ns.ua. MX
Answer
The response has no answer records.
Authority
ua. 2020 SOA in1.ns.ua. domain-master.cctld.ua. 2026022749 1818 909 3024000 2020
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0