Outlook Retaining Messages in Outbox

I have a PC with Outlook 2003 which keeps messages with attachments in the Outbox. Sometimes recipients report they have recieved several hundred copies of the email. I believe the above problem is responsible so every scheduled send/recieve sends a duplicate copy. The system is WinXP sp2 with all windows updates and Outlook 2003 also has all updates. I am using Trend Internet Security 2008 and connecting via BT with a homehub. I have used Housecall and Kaspersky housecall to scan for malware but found none apart from a few cookies, so i dont believe this is the work of a virus but of misconfig/user error somewhere.
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war1Connect With a Mentor Commented:
Hello Powerhousecomputing,

1. Register an important send/receive library file.  Go to Start > Run and type regsvr32 inetcomm.dll

2. Check if antivirus email check is slowing sending and receiving.  Disable it. Check if other programs running in the background is interfering. Disable one at a time the Firewall, antispyware, antispam, and all Norton programs.

3. In the account settings, Advanced settings, change the server timeout time from 1 min to 5 min

4. Check if outgoing mail server authentication is required. Select that option in account settings and use same settings as incoming server

5. Your ISP may be blocking port 25. Try using alternate port 587.

If no joy, you need to use your ISP SMTP server to send out emails.

6. Create a new Outlook profile.

7.  Check with email provider Tech Support to determine if server is having trouble.

Hope this helps!
Are there any sort of Outlook rules running?
For the people receiving the duplicate mail, is it always coming from the same people (senders)?
So its coming from multiple senders not originating from one person?
Check the message size restrictions on the server.
Also does the attachments get sent along with the message or is the attachment stripped off? Any specific extension on the attachments?
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