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Amazon Simple Email Service (SES) and Lambda (Lambda) are required to handle incoming mails. For example; when a user sends an email to [email protected, you will fetch the email data and process it. Lambda is a compute service that lets you run code without provisioning or managing servers. S3 is a storage for the Internet that you can use to store and retrieve any amount of data, at any time, from anywhere on the web. Node.js is a function that will be uploaded as a Lambda function to your AWS account.