52.85.24.42
server-52-85-24-42.cpt52.r.cloudfront.net
52.85.24.73
server-52-85-24-73.cpt52.r.cloudfront.net
52.85.24.77
server-52-85-24-77.cpt52.r.cloudfront.net
52.85.24.88
server-52-85-24-88.cpt52.r.cloudfront.net

2600:9000:20ac:1800:14:8253:8e80:93a1
2600:9000:20ac:1a00:14:8253:8e80:93a1
2600:9000:20ac:2000:14:8253:8e80:93a1
2600:9000:20ac:3a00:14:8253:8e80:93a1
2600:9000:20ac:5c00:14:8253:8e80:93a1
2600:9000:20ac:7a00:14:8253:8e80:93a1
2600:9000:20ac:a400:14:8253:8e80:93a1
2600:9000:20ac:be00:14:8253:8e80:93a1

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