Hi DaRock_SayZ and welcome,
It's possible it has something to do with the HTML that is generated when the form is emailed. Try creating another view with just a link to the form in it. I believe we have a blog about this on our site somewhere. On the submit button add a rule to switch to the view before submitting the form via email and in that new view, just have the link and nothing else. If this works, it's an InfoPath problem related to your default view. If it doesn't work, it's how BlackBerry is treating the HTML. Good luck!