Pushing Email


Is there a way to force (or allow) cpanel accounts to push emails when they come into the server? I would like my iphone to be notified when there is email waiting without having to manually check for email, if possible. I have my iphone accounts set up to push email. Thanks.
I changed the fetch settings from "Automatic" to "Every 15 minutes" and now I see them. Would rather have them pushed so I can see them immediately, but this is better than having to manually open my mail app to receive mail.