13.249.130.116
server-13-249-130-116.ord51.r.cloudfront.net
13.249.130.21
server-13-249-130-21.ord51.r.cloudfront.net
13.249.130.50
server-13-249-130-50.ord51.r.cloudfront.net
13.249.130.57
server-13-249-130-57.ord51.r.cloudfront.net

2600:9000:20be:200:2:52f7:ea40:93a1
2600:9000:20be:2200:2:52f7:ea40:93a1
2600:9000:20be:4000:2:52f7:ea40:93a1
2600:9000:20be:7600:2:52f7:ea40:93a1
2600:9000:20be:7c00:2:52f7:ea40:93a1
2600:9000:20be:8800:2:52f7:ea40:93a1
2600:9000:20be:a000:2:52f7:ea40:93a1
2600:9000:20be:de00:2:52f7:ea40:93a1

au-smtp-inbound-1.mimecast.com.
au-smtp-inbound-2.mimecast.com.