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(edit: incorrect, my bad, see thread)

This is wrong. There is a type of SQS queue that indeed does exactly-once. It costs more, and not the default option, but it is there.

Oh, right, they added their FIFO queues. My bad; thanks for the correction. Worth noting, though, that AWS's own services can't talk to FIFO queues. If you want to wire up SNS or Lambda dead-letter queues to a FIFO queue, you are out of luck.

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