ns2.gonetcore.com has no MX records.
Question and response
Question
dig ns2.gonetcore.com. MX
Answer
The response has no answer records.
Authority
gonetcore.com. 3600 SOA a.root-servers.net. teamde\@netcore.co.in. 648758928 10800 3600 604800 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0