mx.profit-job.com has no CNAME records.
Question and response
Question
dig mx.profit-job.com. NS
Answer
The response has no answer records.
Authority
profit-job.com. 1511 SOA dns.profit-job.com. hostmaster.profit-job.com. 1840861473 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0