34.195.30.59
ec2-34-195-30-59.compute-1.amazonaws.com
34.225.129.138
ec2-34-225-129-138.compute-1.amazonaws.com
52.205.232.129
ec2-52-205-232-129.compute-1.amazonaws.com

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