18.214.48.231
ec2-18-214-48-231.compute-1.amazonaws.com
44.193.99.136
ec2-44-193-99-136.compute-1.amazonaws.com
52.6.148.66
ec2-52-6-148-66.compute-1.amazonaws.com
72.44.55.83
ec2-72-44-55-83.compute-1.amazonaws.com

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