34.237.234.218
ec2-34-237-234-218.compute-1.amazonaws.com
44.216.208.248
ec2-44-216-208-248.compute-1.amazonaws.com
52.1.203.113
ec2-52-1-203-113.compute-1.amazonaws.com
52.206.44.207
ec2-52-206-44-207.compute-1.amazonaws.com
54.86.163.209
ec2-54-86-163-209.compute-1.amazonaws.com
54.91.50.114
ec2-54-91-50-114.compute-1.amazonaws.com

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