mx.succeedwithpaul.com has no CNAME records.
Question and response
Question
dig mx.succeedwithpaul.com. NS
Answer
The response has no answer records.
Authority
succeedwithpaul.com. 3539 SOA dns.succeedwithpaul.com. hostmaster.succeedwithpaul.com. 1860564777 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0