exchange.odpcloud.com has no CNAME records.
Question and response
Question
dig exchange.odpcloud.com. NS
Answer
The response has no answer records.
Authority
odpcloud.com. 3597 SOA ns1.odp-cloud.com. support.omandatapark.com. 95989 14400 7200 2419200 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0