Fixed all the issues

Dockerfile

@@ -3,5 +3,6 @@ FROM python:alpine
 WORKDIR /usr/src/app
 RUN pip install --no-cache requests configargparse xdg aiosmtpd
 COPY ./libertyforward.py .
+
 EXPOSE 25
 CMD ["python", "/usr/src/app/libertyforward.py"]

libertyforward.py

@@ -1,4 +1,6 @@
+from base64 import b64encode
 from time import sleep
+
 import requests
 from aiosmtpd.controller import Controller
 from configargparse import ArgParser
@@ -14,32 +16,17 @@ def parse_args():
     return parser.parse_args()
 
 
-class MailerHandlerMixin:
-    """Base class for the mail handlers"""
-    _api_token = None
-
-    @property
-    def api_token(self):
-        return self._api_token
-
-    @api_token.setter
-    def api_token(self, value):
-        self._api_token = value
-
-
 class KingMailerHandler(object):
 
     async def handle_DATA(self, server, session, envelope):
-        print('Incoming mesage from: {}'.format(envelope.mail_from), flush=True)
         payload = {
             'mail_from': envelope.mail_from,
             'rcpt_to': envelope.rcpt_tos,
-            'data': envelope.content
+            'data': b64encode(envelope.original_content).decode()
         }
         headers = {'X-Server-API-Key': self.api_token}
         response = requests.post('https://kingmailer.org/api/v1/send/raw', json=payload, headers=headers)
         resp_dict = response.json()
-        print(resp_dict, flush=True)
         if resp_dict['status'] == 'success':
             print('Message accepted', flush=True)
             return '250 Message accepted for delivery'
@@ -53,7 +40,7 @@ if __name__ == '__main__':
     args = parse_args()
     handler = KingMailerHandler()
     handler.api_token = args.api_token
-    controller = Controller(handler, hostname='127.0.0.1', port=25)
+    controller = Controller(handler, hostname='0.0.0.0', port=25)
     print('Starting controller thread', flush=True)
     controller.start()
     while True: