cmail.neb.org.ua has no MX records.
Question and response
Question
dig cmail.neb.org.ua. MX
Answer
The response has no answer records.
Authority
neb.org.ua. 14400 SOA ns10.uadns.com. hostmaster.nic.ua. 2025032050 28800 7200 3600000 86400
Additional
. 0 OPT ; payload 512, xrcode 0, version 0, flags 0