Outlook 2007 - Sending message but outbox empty?

[GHM]

Guys, need some help again. My PC at work is driving me nuts. it has been trying to send out one email for months now, but the outbox is empty. I have searched the net trying to find a solution since the IT guy doesn't seem to know how to fix it.

I have found various articles referring to a read receipt that might be stuck, but I have used outlookspy and can't find any read receipt. The error I get when the message can't be sent is as follows:

"Task 'XXXX@XXXX.com - Sending' reported error (0x800CCC0F) : 'The connection to the server was interrupted. If this problem continues, contact your server administrator or Internet service provider (ISP). The server responded: 550 sorry, no mailbox here by that name (#5.1.1)'

The email address in question is my work email address, and has always fuctioned perfectly. The send error is just very irritating, and I need it resolved.

BTW I run XP SP2 and Office 2007.

Thanks

Gus

[pam123]

I would help to know what you've tried and if you've installed the updates for Office 2007, there's a service pack now out.

[GHM]

Pam123, SP1 is installed, all Microsoft products are up to date, and i have reinstalled office twice with no change. This problem has been there since 2007.

[pam123]

It sounds as if you've pretty much covered the "stuck" read receipt problem and you're updated.
So I'll try your patience somewhat further while I asked you some simple minded questions.

When you reinstalled Office ( You uninstalled fully not just a repair reinstall?) did you simply configure outlook with basic settings before you reinstalled any backed up files ?
If it held no more then your mail password and your email address what happened then?