help me fix this

ok I know there are a lot of email issues but I think mine is of a different sort. I have installed 2.2. I have a gmail account set up for my iphone and in mail, the issue is mail grabs any emails before the phone does and then my phone doesn't get the emails once mail has grabbed it, and if I close mail my phone gets emails fine and upon reopening mail, mail wont receive any mail that the phone got first. how can I get both my phone and mail to receive the emails?