34.253.123.106
ec2-34-253-123-106.eu-west-1.compute.amazonaws.com
52.17.251.98
ec2-52-17-251-98.eu-west-1.compute.amazonaws.com
54.77.31.232
ec2-54-77-31-232.eu-west-1.compute.amazonaws.com

inbound-smtp.eu-west-1.amazonaws.com.
mx.aulabierta.es.