PySMTP_AutoForwardHandler.py

#!/usr/bin/env python3

# Libraries
import smtplib
import smtpd
import asyncore
import email
import sys
from datetime import datetime

print('Starting custom mail handling server...')

# We need to know where the SMTP server is heh.
SMTP_OUTBOUND = 'localhost'

# We also need to know what we want the "FROM" address to be
FROM_ADDR = "foo@bar.baz"
DESTINATION_ADDRESS = "foo@bar.baz"

#############
#############
# SMTP SERVER
#############
#############


# noinspection PyMissingTypeHints,PyBroadException
class AutoForwardHandlerSMTP(smtpd.SMTPServer):

    def process_message(self, peer, mailfrom, rcpttos, data, **kwargs):
        print('MESSAGE RECEIVED - [%s]' % datetime.now().strftime('%Y-%m-%d %H:%M:%S'))
        print('Receiving message from:', peer)
        print('Message addressed from:', mailfrom)
        print('Message addressed to  :', rcpttos)
        print('Message length        :', len(data))
        print(data)

        # Flush the output buffered (handy with the nohup launch)
        sys.stdout.flush()

        # Analyze and extract data headers
        msg = email.message_from_string(data)
        orig_from = ''
        try:
            orig_from = msg['From']
            msg['Reply-To'] = orig_from
            # We have to use 'replace header' methods to overwrite existing headers.
            msg.replace_header("From", FROM_ADDR)
        except:
            print("Error manipulating headers:", sys.exc_info()[0])

        conn = smtplib.SMTP(SMTP_OUTBOUND, 10025)
        conn.sendmail(FROM_ADDR, msg["To"], msg.as_string())

        # Flush the output buffered (handy with the nohup launch)
        print("\n\n")
        sys.stdout.flush()
        return


# Listen to port 25 ( 0.0.0.0 can be replaced by the ip of your server but that will work with 0.0.0.0 )
server = AutoForwardHandlerSMTP(('0.0.0.0', 25), None)

# Wait for incoming emails
asyncore.loop()