oraclecloud17.com has no MX records.
Question and response
Question
dig oraclecloud17.com. MX
Answer
The response has no answer records.
Authority
oraclecloud17.com. 300 SOA ns1.p200.dns.us-dcc-phoenix-1.oci.oraclerealm17.com. hostmaster.oraclecloud17.com. 46 3600 900 31536000 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0