acf248bbd128.dfw1.oracleemaildelivery.com has no MX records.
Question and response
Question
dig acf248bbd128.dfw1.oracleemaildelivery.com. MX
Answer
The response has no answer records.
Authority
dfw1.oracleemaildelivery.com. 300 SOA ns1.p202.dns.oraclecloud.net. hostmaster.dfw1.oracleemaildelivery.com. 177326 3600 600 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0