1. Automatically responding to inbound emails with pre-defined templates

    TypeScript

    To automatically respond to inbound emails with pre-defined templates, you can use AWS Simple Email Service (SES) with AWS Lambda. AWS SES can receive incoming emails and trigger an AWS Lambda function. The Lambda function can then use a pre-defined SES template to send an automatic response. This process can also involve using Amazon S3 to store the received emails and Amazon CloudWatch to monitor and log the email-receiving and responding process.

    Here's an outline of how you can set this up using Pulumi:

    1. Create an Amazon S3 bucket to store inbound emails.
    2. Configure AWS SES to receive emails and save them to the S3 bucket.
    3. Create an AWS Lambda function that will be triggered by email receipts.
    4. Inside the Lambda function, use SES to send an email using a predefined template as a response.
    5. Set up necessary permissions for SES and Lambda to access the S3 bucket and send emails.

    The following TypeScript program and explanation will guide you through setting up this infrastructure with Pulumi.

    import * as aws from "@pulumi/aws"; import * as pulumi from "@pulumi/pulumi"; // Create an Amazon S3 bucket to store inbound emails. const emailBucket = new aws.s3.Bucket("inboundEmailBucket"); // Define an AWS SES template for your automated responses. const sesTemplate = new aws.ses.Template("autoResponseTemplate", { name: "myAutoResponseTemplate", html: "<p>Hello, this is an automatic response. Thanks for reaching out!</p>", subject: "Automated Response", }); // Create an AWS Lambda function that will handle incoming emails and send the response. const emailResponseLambda = new aws.lambda.CallbackFunction("emailResponseHandler", { policies: [aws.iam.ManagedPolicies.AWSLambdaBasicExecutionRole], callback: async (event: aws.types.input.ses.ReceiptRuleS3Action) => { const ses = new aws.sdk.SES(); const sender = "no-reply@example.com"; // Replace with your sender email address verified in AWS SES const recipient = event.mail.commonHeaders.from[0]; // Assuming the sender's email is in the 'from' field // Send the email using the pre-defined SES template. await ses.sendTemplatedEmail({ Source: sender, Destination: { ToAddresses: [recipient] }, Template: sesTemplate.name.get(), TemplateData: "{}", // Use a JSON string to populate template variables if needed }).promise(); }, }); // Grant the Lambda function permission to send emails using AWS SES. const lambdaSesPolicy = new aws.iam.Policy("lambdaSesPolicy", { policy: pulumi.all([emailResponseLambda.arn, sesTemplate.name]).apply(([lambdaArn, templateName]) => JSON.stringify({ Version: "2012-10-17", Statement: [{ Effect: "Allow", Action: ["ses:SendEmail", "ses:SendTemplatedEmail"], Resource: "*", // Should be restricted according to least privilege principle }], }) ), }); new aws.iam.RolePolicyAttachment("lambdaSesPolicyAttachment", { role: emailResponseLambda.role.name, policyArn: lambdaSesPolicy.arn, }); // Configure an AWS SES receipt rule set and a rule to trigger the Lambda function. const ruleSet = new aws.ses.ReceiptRuleSet("ruleSet", { ruleSetName: "default-rule-set", }); const emailReceiptRule = new aws.ses.ReceiptRule("emailReceiptRule", { ruleSetName: ruleSet.ruleSetName, recipients: ["no-reply@example.com"], // Replace with the recipient email address actions: [ { s3Action: { bucketName: emailBucket.bucket, position: 0, }, }, { lambdaAction: { functionArn: emailResponseLambda.arn, position: 1, }, }, ], }); // Make sure to subscribe the Lambda function to the SES event source mapping new aws.lambda.Permission("lambdaSesInvoke", { action: "lambda:InvokeFunction", function: emailResponseLambda, principal: "ses.amazonaws.com", sourceArn: pulumi.interpolate`${emailReceiptRule.ruleSetName.apply(rn => `arn:aws:ses:${aws.config.region}:${aws.config.accountId}:receipt-rule/${rn}`)}`, });

    This code sets up the necessary AWS infrastructure to automatically respond to incoming emails. Let's walk through the code:

    • We first create an S3 bucket where incoming emails will be stored.
    • We then define an SES email template. When responding to an email, this template will be used.
    • We define an AWS Lambda function that's responsible for handling incoming emails. This function sends an automated response using the predefined SES template.
    • The lambda function is given an IAM Policy to allow it to send emails and an IAM RolePolicyAttachment attaches this policy to the lambda's execution role.
    • A Receipt Rule Set and a Rule are created to specify what should happen when SES receives an email to a specified recipient address—that is, store the email in S3 and trigger the Lambda function.
    • Finally, we grant specific permissions to SES to trigger the Lambda function using aws.lambda.Permission.

    When an email is received by SES, the email will be stored in S3 and the emailResponseLambda will be invoked. The Lambda will then send a templated email using SES to the sender of the initial email.

    Please note the production implementation should include proper error handling and specify the least privilege permissions for security purposes. Also, be aware of SES sending quotas and your AWS region compatibility.


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