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Amazon SES InvalidLambdaFunction error encountered when sending emails using Amazon SES.

The specified Lambda function is invalid or does not exist.

Understanding Amazon SES

Amazon Simple Email Service (SES) is a cloud-based email sending service designed to help businesses and developers send marketing, notification, and transactional emails. It is a cost-effective and scalable solution that integrates seamlessly with other AWS services, making it a popular choice for developers looking to incorporate email functionality into their applications.

Identifying the Symptom

When using Amazon SES, you might encounter the InvalidLambdaFunction error. This error typically occurs when attempting to trigger a Lambda function in response to an email event, such as a bounce or complaint, and the specified Lambda function is invalid or does not exist.

Common Error Message

The error message you might see is: 'InvalidLambdaFunction: The specified Lambda function is invalid or does not exist.'

Exploring the Issue

The InvalidLambdaFunction error indicates that the Amazon SES service is unable to find or execute the specified Lambda function. This can happen if the function name is incorrect, the function has been deleted, or the function is not properly configured to handle the event.

Potential Causes

  • The Lambda function name is misspelled or incorrect.
  • The Lambda function has been deleted or does not exist in the specified region.
  • The Lambda function does not have the necessary permissions to be invoked by Amazon SES.

Steps to Resolve the Issue

To resolve the InvalidLambdaFunction error, follow these steps:

Step 1: Verify Lambda Function Name

Ensure that the Lambda function name specified in your SES configuration matches the actual name of the function. You can check this in the AWS Lambda console:

  • Go to the AWS Lambda Console.
  • Verify that the function name is correct and exists in the list of functions.

Step 2: Check Lambda Function Permissions

Ensure that the Lambda function has the necessary permissions to be invoked by Amazon SES. You can do this by checking the function's resource-based policy:

  • In the AWS Lambda console, select your function.
  • Navigate to the 'Permissions' tab.
  • Ensure that the policy allows SES to invoke the function.

Step 3: Confirm Function Configuration

Check that the Lambda function is configured correctly to handle the SES event:

  • Ensure the function's handler code is set up to process the event data from SES.
  • Test the function manually with sample event data to confirm it executes as expected.

Additional Resources

For more detailed information, you can refer to the following resources:

By following these steps, you should be able to resolve the InvalidLambdaFunction error and ensure that your Lambda function is correctly configured to work with Amazon SES.

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