ord1.oracleemaildelivery.com has no MX records.
Question and response
Question
dig ord1.oracleemaildelivery.com. MX
Answer
The response has no answer records.
Authority
ord1.oracleemaildelivery.com. 300 SOA ns1.p68.dns.oraclecloud.net. hostmaster.ord1.oracleemaildelivery.com. 595462 3600 600 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0