Amazon Simple Notification Service

The book I read to research this post was Amazon Simple Notification Service User Guide which is a very good book which I downloaded for free from kindle. Amazon SNS is a service where you can specify a topic which I think should be called parameters and if the messages matches that it is sent to you. You have to sign up for a SNS account separately to an AWS account. It's compatible with Cloudwatch & Simple Queque Service. If you want notifications in conjunction with an Amazon service you have to specify that in the SNS console. In addition you must specify where you want the endpoints of various notifications to be. An intermediate point will often be your mail server.