ns2.netins.net has no MX records.
Question and response
Question
dig ns2.netins.net. MX
Answer
The response has no answer records.
Authority
netins.net. 3600 SOA ns3k.aureon.com. hostmaster.netins.net. 2017110903 43200 3600 604800 43200
Additional
. 0 OPT ; payload 1220, xrcode 0, version 0, flags 0