mail.ns-3.eu has no MX records.
Question and response
Question
dig mail.ns-3.eu. MX
Answer
The response has no answer records.
Authority
ns-3.eu. 900 SOA ns1.hix.nl. postmaster.ns-3.eu. 2013021200 10800 3600 604800 900
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0