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Hi, can you switch you queue to FIFO instead of standard?
FIFO has a built-in mechanism to avoid such duplicates: see https://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/FIFO-queues-exactly-once-processing.html
More details about this depuplication mechanism at https://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/using-messagededuplicationid-property.html
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I tried FIFO, but keep spamming the email like 10++,
May i know the duplicate message sending will happened for SNS as well ? I trigger 5 times, gt 1 times is duplicate,seems like the SNS to SQS is unstables, but i couldn't find the issues.