Utilize Amazon SNS for notifications, set S3 to publish upload events to SNS, and subscribe both the Lambda function for thumbnail creation and an email service for notifications to the SNS topic.

Employ Amazon SNS for event handling, configure S3 to send event data to SNS, and have the Lambda function and an SQS queue subscribed to the SNS topic, with the queue also subscribed to an email notification service.

Adopt Amazon SQS for message queuing, configure S3 to dispatch upload events to the SQS queue, and have the Lambda function and an email notification service subscribed to the queue.

Leverage Amazon EventBridge for event routing, configure S3 to forward upload events to EventBridge, establish a rule to invoke the Lambda function for thumbnail generation upon event receipt, and another rule to publish notifications to an SQS queue with an email subscription.