def describe_active_receipt_rule_set():
    """
    Returns the metadata and receipt rules for the receipt rule set that is currently active.
    For information about setting up receipt rule sets, see the Amazon SES Developer Guide .
    This action is throttled at one request per second.
    See also: AWS API Documentation
    
    Examples
    The following example returns the metadata and receipt rules for the receipt rule set that is currently active:
    Expected Output:
    
    :example: response = client.describe_active_receipt_rule_set()
    
    
    :rtype: dict
    :return: {
        'Metadata': {
            'Name': 'string',
            'CreatedTimestamp': datetime(2015, 1, 1)
        },
        'Rules': [
            {
                'Name': 'string',
                'Enabled': True|False,
                'TlsPolicy': 'Require'|'Optional',
                'Recipients': [
                    'string',
                ],
                'Actions': [
                    {
                        'S3Action': {
                            'TopicArn': 'string',
                            'BucketName': 'string',
                            'ObjectKeyPrefix': 'string',
                            'KmsKeyArn': 'string'
                        },
                        'BounceAction': {
                            'TopicArn': 'string',
                            'SmtpReplyCode': 'string',
                            'StatusCode': 'string',
                            'Message': 'string',
                            'Sender': 'string'
                        },
                        'WorkmailAction': {
                            'TopicArn': 'string',
                            'OrganizationArn': 'string'
                        },
                        'LambdaAction': {
                            'TopicArn': 'string',
                            'FunctionArn': 'string',
                            'InvocationType': 'Event'|'RequestResponse'
                        },
                        'StopAction': {
                            'Scope': 'RuleSet',
                            'TopicArn': 'string'
                        },
                        'AddHeaderAction': {
                            'HeaderName': 'string',
                            'HeaderValue': 'string'
                        },
                        'SNSAction': {
                            'TopicArn': 'string',
                            'Encoding': 'UTF-8'|'Base64'
                        }
                    },
                ],
                'ScanEnabled': True|False
            },
        ]
    }
    
    
    :returns: 
    Contain only ASCII letters (a-z, A-Z), numbers (0-9), periods (.), underscores (_), or dashes (-).
    Start and end with a letter or number.
    Contain less than 64 characters.
    
    """
    pass
