Execute the file "MailUtl3.exe". Then you will see the splash form in a moment and you will see a post box icon in the system tray (task tray). Left click or right click the mouse button on the post box icon. Then you will see the main form of the MailUtl3 as shown in Figure 1.
Figure 1
First of all, select [Option|Font] menu item and set the font for your prefer language. Next, select [Option|Settings] menu item. Then you will see a dialog as shown in Figure 2.
Figure 2
You do not need to do anything usually, but change the Listening port if the default listening port number (123) is already in use.