After sending email, outlook mobile window is in front. - how to fix ?

If I start my application, and it sends mail using:
EmailSender.Send("Main1",accounts(0),Message.Value)

Then close the application, then the inbox/outlook mobile is in front.

how can I avoid that ? - and exit right back to shell ?
is it possible to somehow move the poutlook to background before exiting?

You can use Hardware.ShowTodayScreen before closing your application to move the home screen to the foreground.