I'm having a problem with my new computer. I used a different email program before, where once the old computer downloaded my emails, they would come off the server, so my webmail would be empty (I was fine with this).  Now with the new computer, it has synced with the Shaw server, and Shaw webmail (via my iphone) is storing all downloaded emails from my computer.  I have constantly reaching the 1000 mb limit.  How do I change the settings so that my webmail empties every time I download my emails to the computer?  Computer is using Windows Mail.

ADDING:  I have gone in and changed from IMAP to POP settings, but that doesn't seem to have made a difference.