18.65.100.110
server-18-65-100-110.kix50.r.cloudfront.net
18.65.100.114
server-18-65-100-114.kix50.r.cloudfront.net
18.65.100.56
server-18-65-100-56.kix50.r.cloudfront.net
18.65.100.91
server-18-65-100-91.kix50.r.cloudfront.net

2600:9000:221c:3c00:16:d1c6:7f80:93a1
2600:9000:221c:b000:16:d1c6:7f80:93a1
2600:9000:2224:2000:16:d1c6:7f80:93a1
2600:9000:2224:9600:16:d1c6:7f80:93a1
2600:9000:2352:2c00:16:d1c6:7f80:93a1
2600:9000:2352:6400:16:d1c6:7f80:93a1
2600:9000:2352:7000:16:d1c6:7f80:93a1
2600:9000:2352:ba00:16:d1c6:7f80:93a1

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