I have a simple email server implemented using the Python language aiosmtpd package (https://github.com/aio-libs/aiosmtpd). I also have an Apache Camel application with a route that attempts to get mail from the server.
I have been able to successfully send mail to the server, and it is being saved to a directory. However I'm running into a problem when attempting to get mail from the server. The error message from the Camel application is:
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]
The mail server displays no visible messages. I do not know if it maintains a log of some sort. When mail is sent, the server displays lots of information about the message it received from the sender, so it is definitely displaying some information.
I have no idea what the user name should be. Also, does the user require a password? I can't find information on the aiosmtpd site that refers to a user or password.
Is there an expectation that the mail server has a set of recognized/authorized users and that I need to specify one of them? Is there such a thing as not needing a user/password?
Here is the Camel route for reference:
<route id="mail-receive">
<from
uri="imap://{{mail-client.server.host}}:{{mail-client.server.port}}?unseen=true&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>
And here is the mail server python script:
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()
