3.226.66.137
ec2-3-226-66-137.compute-1.amazonaws.com
3.234.157.98
ec2-3-234-157-98.compute-1.amazonaws.com
34.237.146.14
ec2-34-237-146-14.compute-1.amazonaws.com
44.206.177.247
ec2-44-206-177-247.compute-1.amazonaws.com
54.243.215.106
ec2-54-243-215-106.compute-1.amazonaws.com
54.88.58.132
ec2-54-88-58-132.compute-1.amazonaws.com

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