mail.wnet.ua has no MX records.
Question and response
Question
dig mail.wnet.ua. MX
Answer
The response has no answer records.
Authority
wnet.ua. 1800 SOA ns-us.wnet.pro. hostmaster.wnet.ua. 2025111209 1800 1800 604800 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0