eu.rp.oracleemaildelivery.com has no MX records.
Question and response
Question
dig eu.rp.oracleemaildelivery.com. MX
Answer
The response has no answer records.
Authority
rp.oracleemaildelivery.com. 1800 SOA ns1.p01.dynect.net. hostmaster.dyndns.com. 631 3600 600 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0