AWS SNS MessageRejected

The message was rejected by the endpoint.

Understanding AWS SNS

Amazon Simple Notification Service (SNS) is a fully managed messaging service provided by AWS. It is designed to coordinate the delivery of messages to subscribing endpoints or clients. SNS supports a variety of use cases, including application alerts, notifications, and mobile push notifications.

Identifying the Symptom

When using AWS SNS, you might encounter the MessageRejected error. This error indicates that the message you attempted to send was rejected by the endpoint. This can be frustrating, especially when you are unsure of the underlying cause.

Exploring the Issue

The MessageRejected error typically occurs when the message format does not comply with the requirements of the endpoint. This can happen if the message contains unsupported characters, exceeds size limits, or violates other endpoint-specific constraints.

Common Causes

  • Incorrect message format.
  • Unsupported characters in the message.
  • Message size exceeds the allowed limit.

Steps to Resolve the Issue

To resolve the MessageRejected error, follow these steps:

Step 1: Validate Message Format

Ensure that your message format complies with the endpoint's requirements. Refer to the AWS SNS Message and JSON Formats documentation for guidance on the correct format.

Step 2: Check for Unsupported Characters

Review your message content for any unsupported characters. Remove or replace these characters to ensure compatibility with the endpoint.

Step 3: Verify Message Size

Ensure that your message does not exceed the size limits imposed by the endpoint. The maximum size for a message in SNS is 256 KB. If your message is larger, consider breaking it into smaller parts or compressing it.

Step 4: Test with a Sample Message

Before sending your actual message, test with a sample message to verify that it is accepted by the endpoint. This can help identify any issues with the message format or content.

Additional Resources

For more detailed information on troubleshooting SNS issues, visit the AWS SNS Troubleshooting Guide. Additionally, consider checking the AWS Knowledge Center for common solutions to SNS problems.

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