Error 2.7.0 Authentication successful

[MarcTroll]

Hi,

we are switching our Mail Server from a self hosted Mailcow (SMTP) to Microsoft Graph since this is our main mail server for a year now. To allow softwares to send emails via SMTP (that do not allow sending mails through Microsoft Graph directly) I setup an SMTP to Microsoft Graph relay service. This service runs locally without any authentication or similar.

After setting the service up, I reconfigured our stack to use the local mail server. While the most of our software being used work perfectly with the relay, ep3-bs does not. I receive the following exception when trying to send an email (tested with the "forgot password" functionality):

Type
Zend\Mail\Protocol\Exception\RuntimeException
Mitteilung
2.7.0 Authentication successful
File
/opt/public/bw-bs/vendor/zendframework/zend-mail/src/Protocol/AbstractProtocol.php:348
Stack trace
#0 /opt/public/bw-bs/vendor/zendframework/zend-mail/src/Protocol/Smtp/Auth/Plain.php(74): Zend\Mail\Protocol\AbstractProtocol->_expect()
#1 /opt/public/bw-bs/vendor/zendframework/zend-mail/src/Protocol/Smtp.php(222): Zend\Mail\Protocol\Smtp\Auth\Plain->auth()
#2 /opt/public/bw-bs/vendor/zendframework/zend-mail/src/Transport/Smtp.php(401): Zend\Mail\Protocol\Smtp->helo()
#3 /opt/public/bw-bs/vendor/zendframework/zend-mail/src/Transport/Smtp.php(383): Zend\Mail\Transport\Smtp->connect()
#4 /opt/public/bw-bs/vendor/zendframework/zend-mail/src/Transport/Smtp.php(394): Zend\Mail\Transport\Smtp->lazyLoadConnection()
#5 /opt/public/bw-bs/vendor/zendframework/zend-mail/src/Transport/Smtp.php(251): Zend\Mail\Transport\Smtp->connect()
#6 /opt/public/bw-bs/module/Base/src/Base/Service/MailService.php(53): Zend\Mail\Transport\Smtp->send()
#7 /opt/public/bw-bs/module/Base/src/Base/Service/MailService.php(77): Base\Service\MailService->send()
#8 /opt/public/bw-bs/module/Base/src/Base/Service/MailService.php(89): Base\Service\MailService->sendWithAttachments()
#9 /opt/public/bw-bs/module/User/src/User/Service/MailService.php(39): Base\Service\MailService->sendPlain()
#10 /opt/public/bw-bs/module/User/src/User/Controller/AccountController.php(62): User\Service\MailService->send()
#11 /opt/public/bw-bs/vendor/zendframework/zend-mvc/src/Controller/AbstractActionController.php(84): User\Controller\AccountController->passwordAction()
#12 [internal function]: Zend\Mvc\Controller\AbstractActionController->onDispatch()
#13 /opt/public/bw-bs/vendor/zendframework/zend-eventmanager/src/EventManager.php(490): call_user_func()
#14 /opt/public/bw-bs/vendor/zendframework/zend-eventmanager/src/EventManager.php(260): Zend\EventManager\EventManager->triggerListeners()
#15 /opt/public/bw-bs/vendor/zendframework/zend-mvc/src/Controller/AbstractController.php(116): Zend\EventManager\EventManager->triggerEventUntil()
#16 /opt/public/bw-bs/vendor/zendframework/zend-mvc/src/DispatchListener.php(118): Zend\Mvc\Controller\AbstractController->dispatch()
#17 [internal function]: Zend\Mvc\DispatchListener->onDispatch()
#18 /opt/public/bw-bs/vendor/zendframework/zend-eventmanager/src/EventManager.php(490): call_user_func()
#19 /opt/public/bw-bs/vendor/zendframework/zend-eventmanager/src/EventManager.php(260): Zend\EventManager\EventManager->triggerListeners()
#20 /opt/public/bw-bs/vendor/zendframework/zend-mvc/src/Application.php(340): Zend\EventManager\EventManager->triggerEventUntil()
#21 /opt/public/bw-bs/public/index.php(66): Zend\Mvc\Application->run()
#22 {main}

The mail configuration is the following:

    'mail' => array(
        'type' => 'smtp', // or 'smtp' or 'smtp-tls'
        'address' => '[email protected]',

        'host' => 'localhost', // for 'smtp' type only, otherwise remove or leave as is
        'user' => '', // for 'smtp' type only, otherwise remove or leave as is
        'pw' => '', // for 'smtp' type only, otherwise remove or leave as is

        'port' => '25', // for 'smtp' type only, otherwise remove or leave as is
        'auth' => 'plain', // for 'smtp' type only, change this to 'login' if you have problems with SMTP authentication
    ),

As the relay service (https://github.com/ggpwnkthx/Microsoft-Graph-SMTP-Relay/tree/main) does not require authentication, I left user and password empty, which seems to failure in ep3-bs. Due to the exception and the relay log (attached below) I think ep3-bs can not handle cases, where no authentication is provided but expects authentication.

INFO:mail.log:Available AUTH mechanisms: LOGIN PLAIN
INFO:mail.log:Peer: ('172.22.0.1', 59474)
INFO:mail.log:('172.22.0.1', 59474) handling connection
INFO:mail.log:('172.22.0.1', 59474) >> b'EHLO localhost'
INFO:mail.log:('172.22.0.1', 59474) >> b'AUTH PLAIN'
WARNING:mail.log:Session.login_data is deprecated and will be removed in version 2.0
INFO:mail.log:('172.22.0.1', 59474) >> b'QUIT'
INFO:mail.log:('172.22.0.1', 59474) connection lost
INFO:mail.log:('172.22.0.1', 59474) Connection lost during _handle_client()

One of the software we are using, where the relay service works as expected, only produces the following log output:

INFO:mail.log:Available AUTH mechanisms: LOGIN PLAIN
INFO:mail.log:Peer: ('172.22.0.1', 36070)
INFO:mail.log:('172.22.0.1', 36070) handling connection
INFO:mail.log:('172.22.0.1', 36070) >> b'EHLO blau-weiss-stolberg.de'
INFO:mail.log:('172.22.0.1', 36070) >> b'QUIT'
INFO:mail.log:('172.22.0.1', 36070) connection lost
INFO:mail.log:('172.22.0.1', 36070) Connection lost during _handle_client()

The "AUTH PLAIN" message is missing here.