Problem with POP3 Function

I am very pleased about emClient. However, it worksfor me the POP3 device is not complete. The Setting in the ‘Leave messages on the server’ account in connection with 'Delete messages from the server after 14 Days 'is not running. In Thunderbird, this was so far without problems. What can this be? Many Thanks for help and information!

Can you please provide a screenshot of your POP3 settings?