UebiMiau - Powerful Mail Reader

The "Empty Trash" link on top does not empty trash. Also, when the folder
size reaches beyond a certain size (~5 MB), the "Folders" page that shows
the list of folders fails. This is the only place where clicking on
"Delete" for the "Trash" folder actually empties Trash. The problem is I am
stuck now because the Folders page is erroring out and the top "Empty
Trash" does not empty and I am stuck with 10 MB of used space that I want
to free up. Where are the Trash folder contents stored? If you tell me the
Trash folder contents location then I can manually empty it.
Thank you