Hello Richard. From Manage>Troubleshooting>Options you can increase the POP Retrieval logs to Detailed, then re-test and check the results from Manage>Troubleshooting>View Logs by selecting the POP Retrieval log category. I hope this helps :-)
Kyle Kerst
System/Network Administrator
SmarterTools Inc.
(877) 357-6278
www.smartertools.com