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Answer: At-least-once delivery is a feature of Standard SQS queues., SQS visibility timeout may be too short compared to Lambda execution time.
The correct answers are A and D. Option A is correct because Standard SQS queues provide at-least-once delivery, meaning that they may deliver duplicate messages. Option D is also correct because if the SQS queue's visibility timeout is shorter than or equal to the Lambda function’s execution time, the message could become visible in the queue again while the function is still processing it, leading to duplicate processing and hence duplicate emails.
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Why are users receiving duplicate emails from an application using Amazon SQS and AWS Lambda with Amazon SES? (Choose two possible reasons.)
A
At-least-once delivery is a feature of Standard SQS queues.
B
Exact-once processing is not guaranteed by Standard SQS queues.
C
Misconfiguration in Amazon SES DKIM authentication.
D
SQS visibility timeout may be too short compared to Lambda execution time.
E
High Amazon SES bounce rate.