How can I automatically move messages from a dead letter queue back to the original queue in Amazon SQS?
On Dec 1 2021 AWS released the ability to redrive messages from a DLQ back to the source queue(or custom queue).
With dead-letter queue redrive to source queue, you can simplify and enhance your error-handling workflows for standard queues.
Source:
Introducing Amazon Simple Queue Service dead-letter queue redrive to source queues