_kayakoblocks.nic.ua has no MX records.
Question and response
Question
dig _kayakoblocks.nic.ua. MX
Answer
The response has no answer records.
Authority
nic.ua. 14400 SOA ns1.uadns.com. hostmaster.drs.net.ua. 2026010102 28800 7200 3600000 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0