aib22cb128.drz1.oracleemaildelivery.com has no MX records.
Question and response
Question
dig aib22cb128.drz1.oracleemaildelivery.com. MX
Answer
The response has no answer records.
Authority
drz1.oracleemaildelivery.com. 300 SOA ns1.p202.dns.oraclecloud.net. hostmaster.drz1.oracleemaildelivery.com. 131832 3600 600 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0