When starting up Kmail, it always pops up on my connected TV, and mostly out-of-screen as well. I can just about see its statusbar and drag the window from there. Let the window manager handle the positioning, so it can pop up on an active screen.
Thank you for reporting this issue in KDE software. As it has been a while since this issue was reported, can we please ask you to see if you can reproduce the issue with a recent software version? If you can reproduce the issue, please change the status to "REPORTED" when replying. Thank you!
Nope, can't reproduce this any longer.