Samsung Captivate :: POP - With Default Email Client

I have a huge issue with email. I successfully added my Google Apps email account using POP. The client does indeed download the emails, though very slowly, but the main issue I have is that as soon as I manually check for new emails or the Captivate automatically does it (I set it to 15 minutes intervals), all the emails in the inbox on the phone disappears. After much investigating, it turns out that all emails that was already downloaded prior to a reload, were sent to Trash in Gmail. So when I log in online, every message that was originally downloaded to the phone, was now found in Trash. The only workaround I have found in order to keep the emails on the phone, is to delete them instantly. That way they remain in the Deleted Messages until I manually remove them.

So my question is: does the default email client work like it should at all or should I replace it with something. And if so, with what? It's a shame that a new phone such like this have issues with such a basic task.