I had a couple of problems with the SquirrelMail client that I installed. It kept logging the user out after a couple of minutes, very annoying if you are in the middle of typing an email. I checked all the suggestions for preventing this. One of the suggestions was to turn on the refresh of the folder list and set it to something like 10 minutes. This was already on and set to 1 minute, however changing the refresh to 2 minutes fixed my logout problem.