I thought that this piece of information was pretty common knowledge, but apparently it isn't so I'm discussing it today. When you delete an email, it gets moved to the Deleted Items folder and accumulates there. When you delete any type of file or document on your computer, it goes to the Recycle Bil and accumulates there unti you empty it.
For email in almost any email program (except AOL), you can RIGHT click on the Deleted Items (Trash) folder and click "Empty Deleted Iterms (Trash)" option. You will then be asked if you are 'sure' that you want to delete all of the trash…click Yes. In Outlook Express, you find this function in the Edit menu as well. Outlook users will find it in the Tools menu, and Mozilla or Thunderbird users will find a similar funciton in the File menu.
For the Windows Recycle Bin, RIGHT click on it and then click "Empty Recyle Bin" to dump everything in it in one step. Lastly, keep in mind that if you hold down the Shift key on your keyboard while deleting anything, it will bypass the recycle bin or trash.