Looking for help on following problem:

Outlook confused with files in sending.

I deleted the fıles in the sending box but every time when I open the Outlook it tries to send files where there is no file in sending box. (I deleted those files I trıed to send before since outlook experiences problem while sending files, this is a different problem). How Can I reset sending buffer and How Can I make Outlook realide that there is not file to send )