ns3.bitternet.ua has no MX records.
Question and response
Question
dig ns3.bitternet.ua. MX
Answer
The response has no answer records.
Authority
bitternet.ua. 10800 SOA ns1.bitternet.ua. noc.columbus.te.ua. 1804050014 3600 3600 604800 172800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0