In my opinion the best way to have email come immediately to your Blackberry if you have more than one email address is to create a designated email address for your BlackBerry such as
(assuming you use Verizon) and then go to the web site of your server, in my case Comcast, and have the server forward all emails to your Blackberry and at the same time keep those emails remaining on the server so you can access them from your main/laptop computers. I have been doing it this way ever since I got my 8830 over two years ago!