abi149hd0.arn1.oracleemaildelivery.com has no MX records.
Question and response
Question
dig abi149hd0.arn1.oracleemaildelivery.com. MX
Answer
The response has no answer records.
Authority
arn1.oracleemaildelivery.com. 300 SOA ns1.p68.dns.oraclecloud.net. hostmaster.arn1.oracleemaildelivery.com. 701823 3600 600 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0