proxy.kot.poltava.ua has no MX records.
Question and response
Question
dig proxy.kot.poltava.ua. MX
Answer
The response has no answer records.
Authority
kot.poltava.ua. 3600 SOA ns.solver.net.ua. root.kot.poltava.ua. 2022051402 3600 900 3600000 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0