Logging out of e-mail at the desk

I just wanted to give a heads up that when I start many of my shifts, I try to log on to iSpartan at the desk and find someone else still logged in.  Occasionally, I pull up someone's personal e-mail as well.  I've had this happen to me when I just closed my browser without actually logging out.  I figured that people might want to know that this is happening. Thanks!