mail.mx.org.ua has no MX records.
Question and response
Question
dig mail.mx.org.ua. MX
Answer
The response has no answer records.
Authority
mx.org.ua. 3600 SOA ns.mx.org.ua. hostmaster.corvax.kiev.ua. 2025111901 14400 7200 1209600 14400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0