It can be deployed normally on AWS

![image](https://user-images.githubusercontent.com/38454210/78279329-f1528180-7549-11ea-8aec-ba9620a16609.png)

![image](https://user-images.githubusercontent.com/38454210/78279477-25c63d80-754a-11ea-92bc-313e7950424c.png)


subscription = self.sns_client.subscribe(
            TopicArn=self.topic_arn,
            Protocol='email',
            Endpoint='localstack@yopmail.com'
        )
        subscription_arn = subscription['SubscriptionArn']
        subscription_obj = SUBSCRIPTION_STATUS[subscription_arn]
        self.assertEqual(subscription_obj['Status'], 'Not Subscribed')
        _token = subscription_obj['Token']
        self.sns_client.confirm_subscription(
            TopicArn=self.topic_arn,
            Token=_token
        )
        self.assertEqual(subscription_obj['Status'], 'Subscribed')
    def test_dead_letter_queue(self):