masterdns.np6.com has no MX records.
Question and response
Question
dig masterdns.np6.com. MX
Answer
The response has no answer records.
Authority
np6.com. 300 SOA level.np6.com. masterdns.np6.com. 2004103650 1200 600 604800 300
Additional
. 0 OPT ; payload 4000, xrcode 0, version 0, flags 0