Oh boy, do I need help - Please!

I have two email IDs. In my 2nd ID I have a very long document stuck in my outbox. Of course, no emails are coming or going. If I close my email program while working on something else, I can't get back into it except by restarting my computer. Yes, I tried to delete this document initially after realizing what I had done and probably just compounded the matter.

How do I get rid of this document-in-transit and return to normalcy? Your help would be gratefully appreciated.

Carleton