mx.ptj-intl.com has no CNAME records.
Question and response
Question
dig mx.ptj-intl.com. NS
Answer
The response has no answer records.
Authority
ptj-intl.com. 3474 SOA dns.ptj-intl.com. hostmaster.ptj-intl.com. 1770031698 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0