mx0e-006c3502.gpphosted.com has no CNAME records.
Question and response
Question
dig mx0e-006c3502.gpphosted.com. NS
Answer
The response has no answer records.
Authority
gpphosted.com. 900 SOA ns1.proofpoint.com. ops.proofpoint.com. 188925 1800 180 2419200 900
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0