If the normal instance is running, then the cmd just opens the normal instance window. Is there maybe some cmd to ignore the already running instance?

Currently, there is no way. But skipping the below logic if ELECTRON_MAIL_USER_DATA_DIR env value is present might make it work:

ElectronMail/src/electron-main/bootstrap/init.ts

Lines 17 to 21 in ff6630a

    
           if (!app.requestSingleInstanceLock()) { 
        
               // calling app.exit() instead of app.quit() in order to prevent "Error: Cannot find module ..." error happening 
        
               // https://github.com/electron/electron/issues/8862 
        
               app.exit(); 
        
           }

ElectronMail/src/electron-main/bootstrap/app-ready.ts

Line 51 in ff6630a

    
           app.on("second-instance", async () => (await uiContextDependentEndpoints).activateBrowserWindow());

Going to push the change soon.

	if (!app.requestSingleInstanceLock()) {
	// calling app.exit() instead of app.quit() in order to prevent "Error: Cannot find module ..." error happening
	// https://github.com/electron/electron/issues/8862
	app.exit();
	}

Is there a portable version of ElectronMail? #562

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