ns.ninenic.com has no MX records.
Question and response
Question
dig ns.ninenic.com. MX
Answer
The response has no answer records.
Authority
ninenic.com. 86400 SOA ns.ninenic.com. info.ecomsiam.com. 2018032716 86400 7200 21600 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0