[14103] Mail fetch problem

[14103] Mail fetch problem

Since we have upgraded to 14103, SDP randomically fails to fetch email from a POP3 account and stops email fetching causing a problem to our support team.
  2. Fetching stopped due to an error. Trace :: 

  4. com.manageengine.servicedesk.mailutils.MailException: Exception occurred in processRequestAddition method
  5. at com.manageengine.servicedesk.mailutils.RequestMailHandler.processRequestAddition(RequestMailHandler.java:1233)
  6. at com.manageengine.servicedesk.mailutils.RequestMailHandler.handleMailObject(RequestMailHandler.java:266)
  7. at com.manageengine.servicedesk.mailutils.ModuleHandler.handleMailObject(ModuleHandler.java:105)
  8. at com.adventnet.servicedesk.mailutils.MailProcessor.processEMail(MailProcessor.java:69)
  9. at com.adventnet.servicedesk.helpdesk.mail.task.MailFetchingTask.emailThread(MailFetchingTask.java:379)
  10. at com.adventnet.servicedesk.helpdesk.mail.task.MailFetchingTask.executeTask(MailFetchingTask.java:132)
  11. at com.adventnet.taskengine.internal.SchedulerBean.executeTask(SchedulerBean.java:641)
  12. at sun.reflect.GeneratedMethodAccessor81.invoke(Unknown Source)
  13. at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
  14. at java.lang.reflect.Method.invoke(Method.java:498)
  15. at com.adventnet.mfw.bean.BeanProxy.lambda$invoke$0(BeanProxy.java:51)
  16. at com.zoho.mickey.api.DefaultCodeBlock.execute(CodeBlock.java:453)
  17. at com.adventnet.mfw.bean.BeanProxy.invoke(BeanProxy.java:48)
  18. at com.sun.proxy.$Proxy5.executeTask(Unknown Source)
  19. at com.adventnet.taskengine.internal.ScheduleExecutor.executeNextTask(ScheduleExecutor.java:334)
  20. at com.adventnet.taskengine.internal.ScheduleExecutor.run(ScheduleExecutor.java:225)
  21. at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
  22. at java.util.concurrent.FutureTask.run(FutureTask.java:266)
  23. at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
  24. at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
  25. at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
  26. at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
  27. at java.lang.Thread.run(Thread.java:748)
  28. Caused by: com.manageengine.sdpod.v3api.SDPAPIException
  29. at com.manageengine.servicedesk.mailutils.RequestMailUtil.addConversationViaAPI(RequestMailUtil.java:2057)
  30. at com.manageengine.servicedesk.mailutils.RequestMailHandler.processRequestAddition(RequestMailHandler.java:559)
  31. ... 22 more
The problem does not occur all the time but when it does I notice that there are inline images that are not loading properly. 
Let me premise that we do not use EWS but a simple POP3 account on a small service mail server.
I have reproduced the problem with a "troubled email" and have collected the necessary logs which I will attach to the ticket.