AWS Lambda function for forwarding inbound emails from SES and sending outbound with SES

ses_lambda_forward.py

import json
import boto3
import os

from __future__ import print_function
from email.parser import Parser


os.environ['AWS_DEFAULT_REGION'] = 'us-east-1'
# this is the email address you want the inbound mail forwarded to
FORWARD_ADDRESS = ''
# this is an email hosted on the domain with SES inbound
FROM_ADDRESS = ''
# fill in IAM access keys from AWS that have SES sending permission
client = boto3.client('ses',
    aws_access_key_id='',
    aws_secret_access_key='',
)

def decode_email(msg_str):
    p = Parser()
    message = p.parsestr(msg_str)
    decoded_message = ''
    for part in message.walk():
        charset = part.get_content_charset()
        if part.get_content_type() == 'text/plain':
            part_str = part.get_payload(decode=1)
            decoded_message += part_str.decode(charset)
    return decoded_message

def lambda_handler(event, context):
    message = event['Records'][0]['Sns']['Message']
    message = json.loads(message)
    body = decode_email(message['content'])

    subject = message['mail']['commonHeaders']['subject']
    response = client.send_email(
        Source=FROM_ADDRESS,
        Destination={
            'ToAddresses': [
                FORWARD_ADDRESS,
            ],
        },  
        Message={
            'Subject': {
                'Data': subject,
            },
            'Body': {
                'Text': {
                    'Data': body,
                },
                'Html': {
                    'Data': body.replace("\n", "<br />"),
                }
            }
        },  
    )
    return response

I could not have it work. Most probably because I chose SNS instead of some other things.
Here is my copy, updating yours: https://gist.github.com/dkavraal/356dc60f8f6beb8b5070e891adadab96