Limited mail downloaded to thick client

I have an implementation of mail-in-a-box running fine. Whenever I use the roundcube mail interface everything works great. I have recently tried to utilize a linux mail client. I have tried Evolution and Claws mail clients. Both mail clients stopped after downloading about 7500 emails from the server which basically has the most recent mail as five months ago…both clients stopped at the same mail message. Nothing after May 11th of 2016…

Any thoughts on why the server won’t let clients get more recent mail but the roundcube browser has no issues?

Thanks in advance for your comments and suggestions.