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Are you sure that you are not using the Mail app? There are two apps that can do email on the Hero - Mail and Gmail. Mail can be set up to do POP and IMAP mail access to any server that supports those protocols, or Exchange Push mail for connection to an exchange server. The Mail app, even with an IMAP protocol set, does not use IMAP push, but polls for messages on a schedule for POP and IMAP mail servers.
Originally Posted by jessef
The gmail app connects to your gmail account (the one that you used to set up the phone.) It has pretty close to instant push (I hear my phone's notification within a minute of hearing it on my PC when both are running, sometimes on the phone first.) For gmail to synchronize on your phone, from your home screen, you need to go into Settings->Data synchronization->Google and make sure that background processing is checked, as well as gmail.