People find the BlackBerry email to be so good, they don't even bother installing third party email clients. So you rarely ever see reviews about third party email software. But they exist and work. The best ones are Reqwireless from www.reqwireless.com at this time.

I think your best choices are either:

(1) Easiest: Configuring your BWC to poll your IMAP server. You will get new messages every 15 minutes.

(2) Automatic forwarding a CC: to your BlackBerry push address, that's how I do it. My BlackBerry then acts like a great wireless email notifier. Whenever my BlackBerry vibrates, I know I have new email waiting for me, and I can look at its screen pager-style (message displayed right away SMS/pager style after pulling out of holster) or reply to the message from my desktop instead. And your BlackBerry vibrates within 4-10 seconds of somebody clicking SEND to your email address, no need to check email, it's already downloaded to your BlackBerry realtime.