python aiosmtpd server with basic logging

Question

I've been made aware that aiosmtpd logs to the syslog. I'm using a Red Hat Linux distribution and can't find anything related to my SMTP server in the messages or maillog file. I'm trying to debug an issue with a device that can't connect to my SMTP server with basic authentication as I can't find any reason why the device is being rejected by my server. The only way I've been able to debug so far is by using the EHLO and MAIL handlers and printing a message when that stage of the connection is reached. Ideally, I'd like as much as possible to be logged out, like with smtplib that enables you to see each message between the client and server. Is it possible to do this or some basic logging at least and how do I do it if so?

Answer 1

If you search the aiosmtpd codebase for "logging.getLogger", you can find a few places where logging is being configured with Python's standard logging module .

In order to actually see these log messages, you need to configure the log level and add a log handler. Try calling the following function early in your program. It will set up basic logging to stderr and to a file named "aiosmtpd.log".

import logging
import sys

def configure_logging():
    file_handler = logging.FileHandler("aiosmtpd.log", "a")
    stderr_handler = logging.StreamHandler(sys.stderr)
    logger = logging.getLogger("mail.log")
    fmt = "[%(asctime)s %(levelname)s] %(message)s"
    datefmt = None
    formatter = logging.Formatter(fmt, datefmt, "%")
    handler.setFormatter(stderr_handler)
    logger.addHandler(stderr_handler)
    handler.setFormatter(file_handler)
    logger.addHandler(file_handler)
    logger.setLevel(logging.DEBUG)