Can't move emails to sub-folders

Hey everyone. I just signed up with DH yesterday, and I haven’t been able to get email to work properly since. So I can receive and send emails just fine. But whenever I try to categorize my emails and move them into separate folders, they just get deleted. I can create sub-folders just fine from both SquirrelMail and Outlook express, but once I try to stick emails from my inbox into any other folder, it doesn’t work - just disappears.

I thought maybe it was a domain issue or something, so I tried it with another domain I have on DH, and the same issue occurred. Any suggestions?

The other problem is that my email doesn’t get pushed to my treo anymore, and I’m not sure why.