smtp.lonex.com has no CNAME records.
Question and response
Question
dig smtp.lonex.com. NS
Answer
The response has no answer records.
Authority
lonex.com. 1407 SOA ns1.lonex.com. hostmaster.lonex.com. 1772503507 16384 2048 1048576 2560
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0