ns2.fb-t-msedge.net has no MX records.
Question and response
Question
dig ns2.fb-t-msedge.net. MX
Answer
The response has no answer records.
Authority
fb-t-msedge.net. 60 SOA ns1.fb-t-msedge.net. msnhst.microsoft.com. 2018031501 1800 900 2419200 60
Additional
. 0 OPT ; payload 1224, xrcode 0, version 0, flags 0