ns3.pulsen.se has no MX records.
Question and response
Question
dig ns3.pulsen.se. MX
Answer
The response has no answer records.
Authority
pulsen.se. 900 SOA ns1.pulsen.se. registry.pulsen.se. 2016070774 300 3600 86400 900
Additional
. 0 OPT ; payload 4000, xrcode 0, version 0, flags 0