Hello, I use version 4.8
I need to stop Pegasus mail every day in some time by script scheduled in Windows scheduler. I use command :
taskkill /IM "winpm-32.exe" /F
DEL "<folder path>\pmail\MAIL\ADMIN\MAILBOXP.LCK"

its working well but problem with temp folder and files
c:\Users\user\AppData\Local\Temp*.PM$

they still stay on disk and are not deleted. Probably because Pegasus mail was not stopped via GUI and click on File - exit

Does exist some better command to close program as "Graceful close" ? So Pegasus mail also should delete temporary files.

You can use Task Scheduler to run Pmail setting an option in Triggers to "Stop task if it runs longer than" XX hours. This shall do.

To simulate a virtual "close" you can use scripts created with scipt applications like AutoHotkey: It can send mouse clicks to any window you want so it could act like an invisible mouse.

Here's the script I'm using:

PegasusMailClose:
{
   Process, Exist, winpm-32.exe
   PID = %Errorlevel%
   if %PID%
  {
     DetectHiddenWindows, On
     WinClose, Pegasus Mail ahk_pid %PID%
     Process, WaitClose, %PID%, 10
     DetectHiddenWindows, Off
  }
   Return
}