52.213.140.93
ec2-52-213-140-93.eu-west-1.compute.amazonaws.com
52.213.45.9
ec2-52-213-45-9.eu-west-1.compute.amazonaws.com
54.228.66.109
ec2-54-228-66-109.eu-west-1.compute.amazonaws.com

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