OTRS Mailqueue get stuck and fills up

[Psycho007]

We have the problem that from time to time our Mailqueue gets stuck and fills up. It seems that one of the mails get stuck and causes the queue to fill. When trying to send the mail via the Console command:

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su -c "/opt/otrs/bin/otrs.Console.pl Maint::Email::MailQueue --send" -s /bin/bash otrs

We get the following error:

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ERROR: OTRS-otrs.Console.pl-Maint::Email::MailQueue-89 Perl: 5.26.1 OS: linux Time: Thu Oct 7 09:39:14 2021

 Message: The communication '2590090' is already closed, can't be used.

 Traceback (1135717): 
   Module: Kernel::System::CommunicationLog::_LogError Line: 539
   Module: Kernel::System::CommunicationLog::_RecoverCommunicationObject Line: 504
   Module: Kernel::System::CommunicationLog::new Line: 68
   Module: Kernel::System::ObjectManager::_ObjectBuild Line: 307
   Module: Kernel::System::ObjectManager::Create Line: 242
   Module: Kernel::System::MailQueue::_GetCommunicationLog Line: 1653
   Module: Kernel::System::MailQueue::Send Line: 639
   Module: Kernel::System::Console::Command::Maint::Email::MailQueue::Send Line: 199
   Module: Kernel::System::Console::Command::Maint::Email::MailQueue::Run Line: 148
   Module: (eval) Line: 461
   Module: Kernel::System::Console::BaseCommand::Execute Line: 455
   Module: Kernel::System::Console::InterfaceConsole::Run Line: 81
   Module: /opt/otrs/bin/otrs.Console.pl Line: 37

Error: Can't call method "CommunicationIDGet" on an undefined value at /opt/otrs/Kernel/System/MailQueue.pm line 640.

After deleting the first mail in the queue the queue gets send.

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su -c "/opt/otrs/bin/otrs.Console.pl Maint::Email::MailQueue --delete --filter='ID::1' --force" -s /bin/bash otrs
su -c "/opt/otrs/bin/otrs.Console.pl Maint::Email::MailQueue --send" -s /bin/bash otrs

What is causing this error? How do we fix this. It get annoying to have to clear the mailqueue every other day.

[reneeb]

Did you check the communication log? Did you check if it always the same kind of mails that lead to the error?

[Psycho007]

There are no errors in the communication log. And its always diferent Mails.

[Reedu]

There was similiar problem
viewtopic.php?t=38531

Maybe try stop Cron and Deamon, and run just Cron.

[Psycho007]

Thanks for the suggestion. We tried that already, and it did work the first few times. After that, restarting the Cron had no more effect on the error in the Mailqueue.

[fabiociardullo]

Did you ever manage to solve this problem?
I tried with Cron and Daemon but it didn't help...

There are no errors in Log, the sending process get stuck and never stops until we manually delete the first mail in queue

Thanks!

[cisiu]

Hello,

I'd like to add my insights into this issue.

We use several Znuny systems and from time to time (mostly in the last few months) there is this issue, that outgoing mails queue get stuck and what we do is manually send e-mails then reboot the VM (supported Ubuntu LTS with updates) in order to bring MailQueueSend task to running again.

(attachement 1_ with handled worker task stuck)

We use f.e. 6.4.5, 6.5.2 Znuny versions and O365/MS365 as e-mail service (with OAuth).

I have no idea why this occurs, but it seems that this happens more frequently.
If there is anyone with some hints regarding this issue.

Commands used:
su -c "/opt/otrs/bin/otrs.Console.pl Maint::Daemon::Summary" - otrs
su -c "/opt/otrs/bin/otrs.Console.pl Maint::Email::MailQueue --list" - otrs
su -c "/opt/otrs/bin/otrs.Console.pl Maint::Email::MailQueue --send --verbose" - otrs