aib29baf0.mel1.oracleemaildelivery.com has no MX records.
Question and response
Question
dig aib29baf0.mel1.oracleemaildelivery.com. MX
Answer
The response has no answer records.
Authority
mel1.oracleemaildelivery.com. 300 SOA ns1.p68.dns.oraclecloud.net. hostmaster.mel1.oracleemaildelivery.com. 730359 3600 600 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0