mail.prov.org.ua has no MX records.
Question and response
Question
dig mail.prov.org.ua. MX
Answer
The response has no answer records.
Authority
org.ua. 3600 SOA ho1.ns.org.ua. hostmaster.org.ua. 2008207803 3636 1212 1814400 3600
Additional
. 0 OPT ; payload 1220, xrcode 0, version 0, flags 0