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Automating Email Notifications with AWS Lambda and Amazon SES


In today’s digital age, automating routine tasks is essential for efficiency and productivity. One common task is sending notifications or reports via email, especially when dealing with data stored in cloud services like Amazon S3. AWS Lambda, a serverless computing service, offers an ideal solution for automating tasks without needing to provision or manage servers.

In this guide, we will explore leveraging AWS Lambda to create a serverless function that automatically sends an email with an attached file stored in an Amazon S3 bucket. Specifically, we’ll focus on sending emails using Amazon SES (Simple Email Service), a scalable and cost-effective email sending service provided by AWS.


1.  AWS Account:

You must have an active AWS account to utilize AWS Lambda and Amazon S3 services. You can sign up on the AWS website and follow the account creation process if you don’t have one.

2. AWS CLI or AWS Management Console Access:

Ensure you can access the AWS Command Line Interface (CLI) or the AWS Management Console. Familiarity with AWS CLI commands can benefit certain configurations, but most tasks can be performed through the AWS Management Console.

3. Amazon S3 Bucket:

Have an Amazon S3 bucket set up with the file you want to send attached to emails.

4. AWS IAM Role:

Create an AWS IAM (Identity and Access Management) role that Lambda can assume to execute actions on your behalf. Attach the AWSLambdaExecute policy to this role and add permissions allowing access to your Amazon S3 bucket (s3:GetObject, s3:PutObject, etc.) or give the s3 full access permissions, Amazon SNS Full access permissions and Amazon SES Full access permissions.

Before this, verify your emails with the Amazon SES & Amazon SNS services.

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Steps to Create an AWS Lambda Function

Navigate to the AWS Lambda service in the AWS Management Console.

Click on “Create function” and choose “Author from scratch.”

Provide a name, select the runtime (Python, for example), and choose the role created in Step 1.

Click on “Create function.”

Write AWS Lambda Function Code for triggering email when objects are uploaded to Amazon S3

Configure the AWS Lambda Trigger

Add an Amazon S3 trigger to the AWS Lambda function by clicking “Add trigger” in the Lambda Designer. Select your Amazon S3 bucket and set the event type (PUT, POST, COPY).

Save the AWS Lambda function.


In conclusion, the integration of AWS Lambda, Amazon S3, and Amazon SES presents a formidable solution for automating email notifications with attached files. This setup streamlines communication processes and enhances operational efficiency by eliminating manual intervention.

By leveraging the serverless architecture of AWS Lambda, organizations can enjoy scalability, reliability, and cost-effectiveness, as resources are dynamically allocated based on demand. With S3 as the central repository for files and AWS Lambda orchestrating the email notification workflow, businesses can ensure timely and accurate dissemination of critical information, empowering teams to focus on value-added tasks.

Looking ahead, the possibilities for further customization and expansion are vast. From refining email templates to integrating with additional AWS services or third-party tools, there’s ample opportunity to tailor the solution to meet evolving business requirements. As organizations continue to embrace cloud-native technologies, the seamless integration of AWS services exemplifies the agility and innovation driving modern workflows. By embracing this automated email notification system, businesses can unlock new efficiencies, enhance collaboration, and propel their digital transformation journey forward.

Drop a query if you have any questions regarding Amazon SES and we will get back to you quickly.

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1. Can I customize the email templates sent by the Lambda function?

ANS: – Yes, you can customize the email templates according to your requirements. You can modify the content, formatting, and subject line of the email within the AWS Lambda function code.

2. How can I ensure the security of my email attachments and sensitive data?

ANS: – AWS provides robust security features to protect your data. Ensure that proper IAM (Identity and Access Management) policies are in place to control access to your Amazon S3 buckets and restrict permissions as needed. Additionally, consider enabling encryption for your Amazon S3 buckets and using AWS Key Management Service (KMS) to manage encryption keys.

3. Is there a limit to the size of files that can be sent as email attachments?

ANS: – Amazon SES has limits on the size of email messages and attachments. Ensure that your attachments comply with these limits to avoid delivery failures. You may need to consider alternatives such as uploading large files to Amazon S3 and including a link in the email instead of attaching the file directly.

WRITTEN BY Yamini Reddy



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