mxau1.australiaeast.cloudapp.azure.com has no SRV records.
Question and response
Question
dig mxau1.australiaeast.cloudapp.azure.com. SRV
Answer
The response has no answer records.
Authority
australiaeast.cloudapp.azure.com. 60 SOA ns1-06.azure-dns.com. msnhst.microsoft.com. 10001 900 300 604800 60
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0