mx1.securemx.biz has no CNAME records.
Question and response
Question
dig mx1.securemx.biz. NS
Answer
The response has no answer records.
Authority
securemx.biz. 50 SOA ns1-04.azure-dns.com. hostmaster.smxemail.com. 2008050974 3600 600 604800 60
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0