从Java Camel应用程序连接到Python邮件服务器的问题

Question

我有一个使用Python aiosmtpd包(https://github.com/aio-libs/aiosmtpd)实现的简单电子邮件服务器。我还有一个Apache应用程序，它的路由可以尝试从服务器获得邮件。

我已经成功地将邮件发送到服务器，并将其保存到一个目录中。然而，当我试图从服务器获得邮件时，我遇到了一个问题。Camel应用程序的错误消息是：

2020-04-29 10:51:54.476  WARN 17916 --- [/localhost:8025] o.a.c.c.m.MailConsumer                   : Consumer Consumer[imap://localhost:8025?delay=10000&unseen=true] failed polling endpoint: imap://localhost:8025?delay=10000&unseen=true. Will try again at next poll. Caused by: [javax.mail.AuthenticationFailedException - failed to connect, no user name specified?]

javax.mail.AuthenticationFailedException: failed to connect, no user name specified?
    at javax.mail.Service.connect(Service.java:373) ~[jakarta.mail-1.6.4.jar:1.6.4]
    at org.apache.camel.component.mail.MailConsumer.ensureIsConnected(MailConsumer.java:568) ~[camel-mail-3.1.0.jar:3.1.0]
    at org.apache.camel.component.mail.MailConsumer.poll(MailConsumer.java:126) ~[camel-mail-3.1.0.jar:3.1.0]
    at org.apache.camel.support.ScheduledPollConsumer.doRun(ScheduledPollConsumer.java:187) [camel-support-3.1.0.jar:3.1.0]
    at org.apache.camel.support.ScheduledPollConsumer.run(ScheduledPollConsumer.java:106) [camel-support-3.1.0.jar:3.1.0]
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_241]
    at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308) [?:1.8.0_241]
    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180) [?:1.8.0_241]
    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294) [?:1.8.0_241]
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [?:1.8.0_241]
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [?:1.8.0_241]
    at java.lang.Thread.run(Thread.java:748) [?:1.8.0_241]

邮件服务器不显示可见的消息。我不知道它是否保存着某种日志。当邮件被发送时，服务器会显示大量关于它从发件人那里接收到的消息的信息，所以它肯定会显示一些信息。

我不知道用户名应该是什么。此外，用户是否需要密码？我在aiosmtpd站点上找不到引用用户或密码的信息。

是否期望邮件服务器有一组已识别/授权的用户，而我需要指定其中之一？是否存在不需要用户/密码的问题？

这是骆驼的路线，供参考：

<route id="mail-receive">
  <from
    uri="imap://{{mail-client.server.host}}:{{mail-client.server.port}}?unseen=true&amp;delay=10000" />
  <log loggingLevel="INFO" message="start - mail-receive" />
  <to uri="file:{{mail-client.receive.dest-dir}}" />
  <log loggingLevel="INFO" message="end - mail-receive" />
</route>

下面是邮件服务器python脚本：

server.py：

#! /usr/bin/python3

import os
import asyncio
import logging
import tempfile

from aiosmtpd.controller import Controller
from aiosmtpd.handlers import Mailbox


async def mailbox_controller(dir):
    cont = Controller(Mailbox(dir), hostname='', port=8025)
    cont.start()


def main():
    logging.basicConfig(level=logging.DEBUG)

    temp_dir = tempfile.TemporaryDirectory()
    maildir_path = os.path.join(temp_dir.name, 'maildir')

    loop = asyncio.get_event_loop()
    loop.create_task(mailbox_controller(dir=maildir_path))

    try:
        loop.run_forever()
    except KeyboardInterrupt:
        logging.info('Shutting down')


if __name__ == '__main__':
    main()

Answer 1

aiosmtpd是SMTP服务器。SMTP协议用于发送、中继或转发邮件，但不能使用它接收邮件。您需要将邮箱应用程序与IMAP或POP3的某些实现结合起来。