100.25.79.4
ec2-100-25-79-4.compute-1.amazonaws.com
34.196.141.12
ec2-34-196-141-12.compute-1.amazonaws.com
44.223.130.87
ec2-44-223-130-87.compute-1.amazonaws.com

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