mx.wordtothewise.com has no NS records.
NS records for this zone are defined at wordtothewise.com.
NS records for this zone are defined at wordtothewise.com.
Question and response
Question
dig mx.wordtothewise.com. NS
Answer
The response has no answer records.
Authority
wordtothewise.com. 86400 SOA b.wordtothewise.com. hostmaster.wordtothewise.com. 2015102961 14400 3600 2592000 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0