omr02.pc3.atmailcloud.com has no SRV records.
Question and response
Question
dig omr02.pc3.atmailcloud.com. SRV
Answer
The response has no answer records.
Authority
pc3.atmailcloud.com. 900 SOA ns-1296.awsdns-34.org. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0