I don't mind having emails that I send from my laptop showing up in the messages folder on my Blackberry but I'm facing the following issues.
Whilst composing the email on my Laptop all of a sudden my email notification LED starts flashing. OPen messages expecting to see a new incoming email but no its the one I'm creating.
Carry on creating the email and the blackberry goes again. This happens around every 5 seconds whilst creating the email. So if I'm sending a large email I can get 20/30 items turn up in the messages folder.
Seems like a bug with BIS. Try removing and re-adding the e-mail address you added to BIS from your blackberry or from the BIS site using your computer.
Posted from my CrackBerry at wapforums.crackberry.com