local-develop-smtp.py

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

from __future__ import print_function
from smtpd import SMTPServer
import asyncore
import quopri


class DebuggingServer(SMTPServer):
    def process_message(self, peer, mailfrom, rcpttos, data):
        inheaders = 1
        lines = data.split('\n')
        print('---------- MESSAGE FOLLOWS ----------')
        for line in lines:
            if inheaders and not line:
                print('X-Peer: %s' % peer[0])
                inheaders = 0

            if line.endswith('='):
                print(quopri.decodestring(line[:-1]), end='')
            else:
                print(quopri.decodestring(line))
        print('------------ END MESSAGE ------------')

if __name__ == '__main__':
    server = DebuggingServer(('127.0.0.1', 1025), None)
    print('Listening on 127.0.0.1:1025')
    asyncore.loop()