ns3.tele3.eu has no MX records.
Question and response
Question
dig ns3.tele3.eu. MX
Answer
The response has no answer records.
Authority
tele3.eu. 600 SOA ns1.tele3.cz. root.tele3.cz. 1770334269 28800 7200 1209600 43200
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0