mx.wordtothewise.com has no CNAME records.
Question and response
Question
dig mx.wordtothewise.com. NS
Answer
The response has no answer records.
Authority
wordtothewise.com. 62960 SOA b.wordtothewise.com. hostmaster.wordtothewise.com. 2015102961 14400 3600 2592000 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0