108.128.155.182
ec2-108-128-155-182.eu-west-1.compute.amazonaws.com
52.51.14.253
ec2-52-51-14-253.eu-west-1.compute.amazonaws.com
99.81.147.99
ec2-99-81-147-99.eu-west-1.compute.amazonaws.com

mx-01-eu-west-1.prod.hydra.sophos.com.
mx-02-eu-west-1.prod.hydra.sophos.com.