34.253.130.192
ec2-34-253-130-192.eu-west-1.compute.amazonaws.com
99.80.69.226
ec2-99-80-69-226.eu-west-1.compute.amazonaws.com

2a05:d018:1c9:4202:a9c0:b471:5580:4b0
2a05:d018:1c9:4203:5485:effe:6bfb:c90f

mxext1.mailbox.org.
mxext2.mailbox.org.
mxext3.mailbox.org.