The Outbox is probably corrupt.
Go to Tools | Options | Maintenance and see where OE is storing its files.
Close OE.
Go there with Windows Explorer and delete Outbox.dbx. With Win2K and
WinXP it will be a hidden file.
OE will create a new one when you reopen it.

If you think the Outbox may have messages you want to recover, instead of
deleting it, move, not copy, it to an empty Windows folder and then use
DBXtract to recover the messages.
DBXtract ($5): http://www.oehelp.com/DBXtract/

--
Frank Saunders, MS-MVP OE/WM
http://www.fjsmjs.com
Answer in newsgroup. Don't send mail.


Nice call, and well spotted Frank, I've just done that ( it was 8.5MB even
though empty) so I guessed that would cure it.
I deleted outbox.dbx, emptied the recycle bin, did a 'search ' for
outbox.dbx, which didnt exist now. Then opened OE6 , and closed it again,
searched for outbox.dbx again - now 75.8K, so looking good. Opened OE6 send
myself an email to test it via a throw away address, and its still a
problem... Message stopped in outbox, and continued to send a copy at each
press of send/receive.. Do you think its one of the other Mailboxes,
including the custom ones I have set up at all....
Thanks for the help..