ns3.lanet.ua has no MX records.
Question and response
Question
dig ns3.lanet.ua. MX
Answer
The response has no answer records.
Authority
lanet.ua. 300 SOA ns1.lanet.ua. hostmaster.lanet.ua. 2101012251 10800 7200 1209600 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0