This is probably an issue you have to tackle through gmail... Although I am unfamiliar with gmail and do not use it personally, I wouldn't think that your Blackberry settings are set to do this.
Hey Sunkast that didn't work for me. I am not sure where to access my BIS through. I tried accessing it through my set up email icon on the home screen and it took me to my email account, but the only choices I have under my email is edit and delete. And I clicked on the link using my phone company's website using my handheld and I get an error message saying I can't access the website on my bb