35.81.91.50
ec2-35-81-91-50.us-west-2.compute.amazonaws.com
35.82.147.45
ec2-35-82-147-45.us-west-2.compute.amazonaws.com
35.83.10.99
ec2-35-83-10-99.us-west-2.compute.amazonaws.com

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