lin1.oracleemaildelivery.com has no SRV records.
Question and response
Question
dig lin1.oracleemaildelivery.com. SRV
Answer
The response has no answer records.
Authority
lin1.oracleemaildelivery.com. 300 SOA ns1.p68.dns.oraclecloud.net. hostmaster.lin1.oracleemaildelivery.com. 714907 3600 600 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0