ns3.msedge.net has no MX records.
Question and response
Question
dig ns3.msedge.net. MX
Answer
The response has no answer records.
Authority
msedge.net. 900 SOA ns1.msedge.net. msnhst.microsoft.com. 2016041201 1800 900 2419200 3600
Additional
. 0 OPT ; payload 1224, xrcode 0, version 0, flags 0