Just curious is there a reason that you're still on 4.0.5? Like a platform no longer supported or something? From this thread back in september you asked if you should upgrade to 4.5.7 to fix the large log file issue...
logswatch.out and zmlogger.out BIG!
(which has definitely proven fixed in 4.5.7 >
[SOLVED] running a version 4.5.6 or prior? Prevent Large Log File)
Be sure to
make a good backup!