ns.domainnetwork.se has no MX records.
Question and response
Question
dig ns.domainnetwork.se. MX
Answer
The response has no answer records.
Authority
domainnetwork.se. 86400 SOA udns1.cscdns.net. premiumdns.support.neustar. 2013080811 14400 3600 2419200 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0