[imp] Problem with folders

[Jason Smith]

Hello everyone,

Im running the latest version of everything needed to get imp up and running
and i did finally get it all working together.  But here this the problem im
having. The only folder showing up is the inbox.  There are other folders
that should show up like trash can and such like that but non. When i try to
create a folder it says "The folder "testfolder" was not created. This is
what the server said: Invalid mailbox name "  does anyone know what that
means? im running courier imap. so anyone that can help me with this it is
greatly appreciated.