iad1.oracleemaildelivery.com has no MX records.
Question and response
Question
dig iad1.oracleemaildelivery.com. MX
Answer
The response has no answer records.
Authority
iad1.oracleemaildelivery.com. 1800 SOA ns1.p01.dynect.net. hostmaster.dyndns.com. 754531 3600 600 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0