messages won't send from outbox until Outlook 2003 is restarted

I've seen this behavior on a couple of our workstations and the problem recurs occasionally.

A user with Windows XP SP2 and Outlook 2003 will accumulate a number of messages in their Outbox.  There is apparently nothing wrong with the outgoing messages except Outlook simply fails to successfully send them.  No error message is given.  Upon closing and re-opening Outlook the messages "magically" go out.  Does anyone have any idea what could be causing this?

These Outlook installs use both a POP3/SMTP server running Courier on Linux and a Microsoft Exchange server for collecting and sending mail.  The Linux server is the default account.
hawthornedirectAsked:
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war1Connect With a Mentor Commented:
hawthornedirect,

On the times when you cannot send, are the emails particularly large?

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


7. See this troubleshooter for not sending
http://www.slipstick.com/problems/nosend.htm
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war1Commented:
Greetings, hawthornedirect !

With Outlook open, go to Tools > Options > Mail Setup.  Check "Send immediately when connected".

Click on the Send/Receive button on Mail Setup General tab. Make sure both options "Include this group in Send/Receive" are checked.  Make sure that your account is included in the Group to send.

Check "Schedule an automatic send/receive every x minutes. Fill in the X. Click OK. Restart Outlook.

Best wishes!
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hawthornedirectAuthor Commented:
All of our Outlook clients are set to do periodic send/receive's and they are all set to send immediately.  We also manually clicked send/receive several times while watching the queued messages remain sitting in the Outbox.  It's set correctly to work correctly.  Nonetheless, on occasion the messages won't go until Outlook is closed and then re-opened.
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war1Commented:
>> on occasion the messages won't go until Outlook is closed and then re-opened.

Oh, this is an intermittent problem?  This is difficult to troubleshoot as it is not a hard failure.  Disable programs running in the background, like antivirus or firewall.
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hawthornedirectAuthor Commented:
We have the Windows firewall disabled with a group policy.  The only active antivirus/firewall software running on these workstations if TrendMicro's Officescan client.  The firewall is configured to allow anything outgoing using any protocol.
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