FWIW, and for those who may be unaware or this, there are actually two email apps on your PB (at least I know for 2.1 beta and I think for 2.0). One is the messages app that we're all familiar with. The other is android's Email. You're probably not aware of the android app because it is not accessible from the desktop. Is is accessible, though, through Ghost Commander, an android file explorer available for free from app world. To find it, open Ghost, click on Applications from the home screen, scroll down and click email, then shortcuts, then the top Email-Main. Once the app opens, you can set up your account(s).
Originally Posted by pronomad
There are two (at least) advantages to the android app- one is that you will have access to your sent messages, from whatever source they were sent from. The other is in managing attachments. Since the android app will allow you to use an android file browser to search for and attach files (Ghost Commander being one of these) you can use a file browser that will actually see the PB's file structure and you can navigate to and attach files accordingly (think of having a couple of thousand pics or documents on your PB, all nicely organized into subfolders, only to find that the native file browser doesn't recognize these folders.
The drawbacks are that it is not quite as easy to launch as Messages, since you have to launch Ghost Commander in order to open the app, but if you set up Ghost Commander correctly, you can launch Email with two clicks total as opposed to one for Messages. The other is that the notifications icon, while it will in fact notify you of incoming mail, will not launch the app- you have to launch it the way you would normally.