dsl.netins.net has no MX records.
Question and response
Question
dig dsl.netins.net. MX
Answer
The response has no answer records.
Authority
dsl.netins.net. 86400 SOA ns3k.aureon.com. hostmaster.netins.net. 2017103688 7000 3600 604800 86400
Additional
. 0 OPT ; payload 1220, xrcode 0, version 0, flags 0