3.209.189.182
ec2-3-209-189-182.compute-1.amazonaws.com
3.91.254.128
ec2-3-91-254-128.compute-1.amazonaws.com
3.92.140.96
ec2-3-92-140-96.compute-1.amazonaws.com
34.198.14.241
ec2-34-198-14-241.compute-1.amazonaws.com
35.153.12.60
ec2-35-153-12-60.compute-1.amazonaws.com
52.204.40.130
ec2-52-204-40-130.compute-1.amazonaws.com

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