This is probably incredibly obvious, but I can't seem to figure out how to do this.

So I'm using the iPad email app to read my mails. Works very well. It's configured to work with my Google apps account (same as a normal gmail account, but using my own domain). I can read the emails, send emails, forward them, archive them,... But not delete them, not as far as I can see anyway. So every time I want to delete an email now, I need to to login to Google's web application. This is annoying.
Is this really not possible, or am I overlooking the obvious here?