vcp1.oracleemaildelivery.com has no MX records.
Question and response
Question
dig vcp1.oracleemaildelivery.com. MX
Answer
The response has no answer records.
Authority
vcp1.oracleemaildelivery.com. 300 SOA ns1.p68.dns.oraclecloud.net. hostmaster.vcp1.oracleemaildelivery.com. 725898 3600 600 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0