AWS SNS subscription keeps deleting the subscription itself

I subscribed to a SNS topic with an endpoint of an email address.

I have received notice of unsubscribing from the topic lastnight, I asked all who had access to the inbox, nobody clicked the unsubscribe link.

I recreated the subscription and this morning it unsub itself again.

How could that be? And how can I prevent this from happening again? I looked up in CloudTrail but unsubscribe action is not logged unless they are made with in the console or via the API.

Any indicator would be helpful , thanks.

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It might indeed be the gmail automatic spam filter, but since there are no logs available this is hard to verify.

From the AWS Documentation I see that you can enable authentication for deletion. This should prevent it being deleted by gmail.

Deletes a subscription. If the subscription requires authentication for deletion, only the owner of the subscription or the topic's owner can unsubscribe, and an AWS signature is required. If the Unsubscribe call does not require authentication and the requester is not the subscription owner, a final cancellation message is delivered to the endpoint, so that the endpoint owner can easily resubscribe to the topic if the Unsubscribe request was unintended.

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