We had some issues this evening that were initiated by a minor system problem and turned into a more system wide issue by a cloudy minded system admin who just got out of the hospital yesterday.

     When I got up this evening I tried to access my e-mail and all the sudden my mail was gone.

      So I tried to check the size of my spool and the system told me I did not have permission.

      At this point it would not return to the command prompt nor would most of the servers I checked trying to identify the issue.

      After multiple reboots, I finally noticed ufw was missing the user rules on mail and that was the cause.  I suspect the rules disappeared because the machine ran itself out of disk space with debug data.