ns2.webgoku.com has no MX records.
Question and response
Question
dig ns2.webgoku.com. MX
Answer
The response has no answer records.
Authority
webgoku.com. 2560 SOA ns2.webgoku.com. hostmaster.webgoku.com. 2020121910 16384 2048 1048576 2560
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0