Hello,

two or three times in a day I see these error messages in system log:

Wed Nov 22 17:17:01 2023 (Europe/Rome) error OTOBO-otobo.Console.pl-Maint::Email::MailQueue-86 There was an error executing Execute() in Kernel::System::Console::Command::Maint::Email::MailQueue: ERROR: OTOBO-otobo.Console.pl-Maint::Email::MailQueue-86 Perl: 5.34.0 OS: linux Time: Wed Nov 22 16:16:59 2023


Wed Nov 22 17:17:00 2023 (Europe/Rome) error OTOBO-otobo.Console.pl-Maint::Email::MailQueue-86 CommunicationLog(ID:30543,AccountType:-,AccountID:-,Direction:Outgoing,Transport:Email,ObjectLogType:Message,ObjectLogID:34279)::Kernel::System::MailQueue => Temporary problem returned from server, requeuing message for sending. Message: SMTPCode: 421, ErrorMessage: Could not send message to server: 421, [Net::SMTP] Timeout!


Wed Nov 22 17:17:00 2023 (Europe/Rome) error OTOBO-otobo.Console.pl-Maint::Email::MailQueue-86 CommunicationLog(ID:30543,AccountType:-,AccountID:-,Direction:Outgoing,Transport:Email,ObjectLogType:Message,ObjectLogID:34279)::Kernel::System::MailQueue => Message could not be sent! Error message: Could not send message to server: 421, [Net::SMTP] Timeout!


Wed Nov 22 17:16:59 2023 (Europe/Rome) error OTOBO-otobo.Console.pl-Maint::Email::MailQueue-86 CommunicationLog(ID:30543,AccountType:-,AccountID:-,Direction:Outgoing,Transport:Email,ObjectLogType:Message,ObjectLogID:34279)::Kernel::System::Email => Error sending message using backend 'Kernel::System::Email::SMTPTLS'.

Wed Nov 22 17:16:59 2023 (Europe/Rome) error OTOBO-otobo.Console.pl-Maint::Email::MailQueue-86 CommunicationLog(ID:30543,AccountType:-,AccountID:-,Direction:Outgoing,Transport:Email,ObjectLogType:Message,ObjectLogID:34279)::Kernel::System::Email::SMTP => Could not send message to server: 421, [Net::SMTP] Timeout!

I also receive email notification with more details:

ERROR: OTOBO-otobo.Console.pl-Maint::Email::MailQueue-86 Perl: 5.34.0 OS: linux Time: Wed Nov 22 16:18:45 2023

 Message: CommunicationLog(ID:30546,AccountType:-,AccountID:-,Direction:Outgoing,Transport:Email,ObjectLogType:Message,ObjectLogID:34283)::Kernel::System::Email::SMTP => Could not send message to server: 421, [Net::SMTP] Timeout!

 Traceback (365944):
   Module: Kernel::System::CommunicationLog::_LogError Line: 563
   Module: Kernel::System::CommunicationLog::ObjectLog Line: 321
   Module: Kernel::System::Email::SMTP::Send Line: 358
   Module: Kernel::System::Email::SendExecute Line: 762
   Module: Kernel::System::MailQueue::Send Line: 711
   Module: Kernel::System::Console::Command::Maint::Email::MailQueue::Send Line: 206
   Module: Kernel::System::Console::Command::Maint::Email::MailQueue::Run Line: 155
   Module: (eval) Line: 480
   Module: Kernel::System::Console::BaseCommand::Execute Line: 474
   Module: (eval) Line: 155
   Module: Kernel::System::Daemon::DaemonModules::SchedulerTaskWorker::Cron::Run Line: 134
   Module: Kernel::System::Daemon::DaemonModules::SchedulerTaskWorker::Run Line: 243
   Module: (eval) Line: 386
   Module: main::Start Line: 386
   Module: /opt/otobo/bin/otobo.Daemon.pl Line: 164

ERROR: OTOBO-otobo.Console.pl-Maint::Email::MailQueue-86 Perl: 5.34.0 OS: linux Time: Wed Nov 22 16:18:50 2023

 Message: CommunicationLog(ID:30546,AccountType:-,AccountID:-,Direction:Outgoing,Transport:Email,ObjectLogType:Message,ObjectLogID:34283)::Kernel::System::Email => Error sending message using backend 'Kernel::System::Email::SMTPTLS'.

 Traceback (365944):
   Module: Kernel::System::CommunicationLog::_LogError Line: 563
   Module: Kernel::System::CommunicationLog::ObjectLog Line: 321
   Module: Kernel::System::Email::SendExecute Line: 772
   Module: Kernel::System::MailQueue::Send Line: 711
   Module: Kernel::System::Console::Command::Maint::Email::MailQueue::Send Line: 206
   Module: Kernel::System::Console::Command::Maint::Email::MailQueue::Run Line: 155
   Module: (eval) Line: 480
   Module: Kernel::System::Console::BaseCommand::Execute Line: 474
   Module: (eval) Line: 155
   Module: Kernel::System::Daemon::DaemonModules::SchedulerTaskWorker::Cron::Run Line: 134
   Module: Kernel::System::Daemon::DaemonModules::SchedulerTaskWorker::Run Line: 243
   Module: (eval) Line: 386
   Module: main::Start Line: 386
   Module: /opt/otobo/bin/otobo.Daemon.pl Line: 164

ERROR: OTOBO-otobo.Console.pl-Maint::Email::MailQueue-86 Perl: 5.34.0 OS: linux Time: Wed Nov 22 16:18:50 2023

 Message: CommunicationLog(ID:30546,AccountType:-,AccountID:-,Direction:Outgoing,Transport:Email,ObjectLogType:Message,ObjectLogID:34283)::Kernel::System::MailQueue => Message could not be sent! Error message: Could not send message to server: 421, [Net::SMTP] Timeout!

 Traceback (365944):
   Module: Kernel::System::CommunicationLog::_LogError Line: 563
   Module: Kernel::System::CommunicationLog::ObjectLog Line: 321
   Module: Kernel::System::MailQueue::_SendError Line: 867
   Module: Kernel::System::MailQueue::Send Line: 721
   Module: Kernel::System::Console::Command::Maint::Email::MailQueue::Send Line: 206
   Module: Kernel::System::Console::Command::Maint::Email::MailQueue::Run Line: 155
   Module: (eval) Line: 480
   Module: Kernel::System::Console::BaseCommand::Execute Line: 474
   Module: (eval) Line: 155
   Module: Kernel::System::Daemon::DaemonModules::SchedulerTaskWorker::Cron::Run Line: 134
   Module: Kernel::System::Daemon::DaemonModules::SchedulerTaskWorker::Run Line: 243
   Module: (eval) Line: 386
   Module: main::Start Line: 386
   Module: /opt/otobo/bin/otobo.Daemon.pl Line: 164

ERROR: OTOBO-otobo.Console.pl-Maint::Email::MailQueue-86 Perl: 5.34.0 OS: linux Time: Wed Nov 22 16:18:50 2023

 Message: CommunicationLog(ID:30546,AccountType:-,AccountID:-,Direction:Outgoing,Transport:Email,ObjectLogType:Message,ObjectLogID:34283)::Kernel::System::MailQueue => Temporary problem returned from server, requeuing message for sending. Message: SMTPCode: 421, ErrorMessage: Could not send message to server: 421, [Net::SMTP] Timeout!

 Traceback (365944):
   Module: Kernel::System::CommunicationLog::_LogError Line: 563
   Module: Kernel::System::CommunicationLog::ObjectLog Line: 321
   Module: Kernel::System::MailQueue::_SendError Line: 966
   Module: Kernel::System::MailQueue::Send Line: 721
   Module: Kernel::System::Console::Command::Maint::Email::MailQueue::Send Line: 206
   Module: Kernel::System::Console::Command::Maint::Email::MailQueue::Run Line: 155
   Module: (eval) Line: 480
   Module: Kernel::System::Console::BaseCommand::Execute Line: 474
   Module: (eval) Line: 155
   Module: Kernel::System::Daemon::DaemonModules::SchedulerTaskWorker::Cron::Run Line: 134
   Module: Kernel::System::Daemon::DaemonModules::SchedulerTaskWorker::Run Line: 243
   Module: (eval) Line: 386
   Module: main::Start Line: 386
   Module: /opt/otobo/bin/otobo.Daemon.pl Line: 164

Error:
Could not send message with ID '2885'! Please refer to the log.
Error: Failed.

Since our customer is still evaluating if put Otobo in production we need to know if these error could have an impact or if timeout messages will just be resent. Moreover, do you know if there is any setting I can adjust to avoid this problem?

Thanks!