Reliability of AWS SNS delivery to AWS Lambda

Question

From the AWS documentation, I can see that SNS guarantees at least once message delivery to SQS, but it is not clear whether the same is applicable when the notification is sent to Lambda. So does SNS provide at least one message delivery when a message is sent to AWS Lambda?

Answer 1

When the message is published on a topic, Amazon SNS attempts to deliver notifications to all subscribers who are registered for that topic. Due to certain issues like internet issues or Email delivery restrictions sometimes the notification may not successfully reach the HTTP or to the email end-point. If it is critical that all published messages be successfully processed developers should have notifications delivered to an SQS queue and this is applied to all Non-SQS subscribers.

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