Is there any way to identify who is sending messages to the Queue?

Hi pascal

In the case of Amazon SQS queues, unfortunately, there's no built-in mechanism to directly identify the sender of a message.

Check for Existing Sender Information:

Message Attributes: Have a look at the messages themselves. If your applications already include a custom message attribute with sender identification (e.g., application name, user ID), you can retrieve it using the message.Attributes property in your receiving code (specific method names vary depending on the AWS SDK you're using).

Message metadata for Amazon SQS: This document explains how to use message attributes, which can potentially hold sender information: https://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/sqs-message-metadata.html

Sending message attributes to an Amazon SQS queue: This document provides further details on including custom attributes with messages:

https://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/sqs-message-metadata.html