34.218.152.131
ec2-34-218-152-131.us-west-2.compute.amazonaws.com
44.240.169.36
ec2-44-240-169-36.us-west-2.compute.amazonaws.com
52.43.60.129
ec2-52-43-60-129.us-west-2.compute.amazonaws.com

in1-smtp.messagingengine.com.
in2-smtp.messagingengine.com.