23.23.85.29
ec2-23-23-85-29.compute-1.amazonaws.com
3.224.180.9
ec2-3-224-180-9.compute-1.amazonaws.com
44.218.86.37
ec2-44-218-86-37.compute-1.amazonaws.com
52.21.87.232
ec2-52-21-87-232.compute-1.amazonaws.com
52.86.226.123
ec2-52-86-226-123.compute-1.amazonaws.com

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