Symptoms

Permanent failure sending message
 

Diagnoses

Randomly K2 decides not to send email out, currently the workaround is to reset the K2 service.

When this does happen though the process instances do not go into error state.

The error message I get (on the Log files) is:

"4220991","2016-07-02 13:17:56","Error","MessageBus","61007","SendMessageException","MessageBusRuntime","61007 Permanent failure sending message Group Interview Confirmation: System.Exception: No destinations could send the message Group Interview Confirmation.
at SourceCode.MessageBus.Server.MessageBusRuntime.SourceCode.MessageBus.IMessageDestination.ReplyTo(IMessage message, MessageBodyReader reply, MessageExtendedInformation extended)
at SourceCode.MessageBus.Server.MessageBusRuntime.SourceCode.MessageBus.IMessageDestination.ReplyTo(IMessage message, MessageBodyReader reply, MessageExtendedInformation extended)","","","HUKSTWORKFLOW01:C:Program Files (x86)K2 blackpearlHost ServerBin","4189477","3c988e8eb80e4c038a0d630442f924c5",""


 

Resolution

Check within the process itself to see if the email destination has been correctly set.