Simple SMTP to debug emails

mailcatcher.py

# inspired by Ruby's mailcatcher but simple drop to run version in Python
# check logs for email content
import asyncore, email
from smtpd import SMTPServer

class MyServer(SMTPServer):

    def process_message(self, peer, mailfrom, *args, **kwargs):
        print('====')
        print('= ')
        print(mailfrom, peer)
        print('TO', args[0])
        msg = email.message_from_bytes(args[1])
        for header in msg.items():
            print(header)
        for part in msg.walk():
            print(part.get_content_type())
            data = part.get_payload(decode=True)
            if data:
                print(data.decode('utf8'))
        print(kwargs)
port = int(os.environ.get('SMTP_PORT', 1025))
server = MyServer(('localhost', port), None)
print("Listen on", port)
try:
    asyncore.loop()
except KeyboardInterrupt:
    pass