This option is provided to log, to whom JCourier had sent/forwarded mails and what all mails it could not deliver, and any other error messages that occured during the functioning of JCourier. The Log file will be created in "\install Dir\Logs\" directory.
If you want these things to be logged, choose "Options | Logging", the following wndow will be displayed.
If you want to log all these details, just check the "Enable Logging" check box and press OK. Uncheck this if you do not want to log these details.
If you want to clear the Log file, Just click on the "Clean-up Log" button.