ns2.eu.level3.net has no MX records.
Question and response
Question
dig ns2.eu.level3.net. MX
Answer
The response has no answer records.
Authority
eu.level3.net. 3600 SOA ns1.eu.level3.net. abuse.eu.level3.net. 2015060500 10800 3600 2592000 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0