3.95.97.26
ec2-3-95-97-26.compute-1.amazonaws.com
34.204.155.183
ec2-34-204-155-183.compute-1.amazonaws.com
44.213.18.133
ec2-44-213-18-133.compute-1.amazonaws.com

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