Corinne,
As an engineer, I have come across this many a times. Some solutions have
and some haven't. It seems to be a protocol related issue (between NT kernel
and Outlook/IE/OE)
Suggestions:
1. Try another SMTP server
2. Increase the server time-out value in your account settings
3. Change the MTU value in registry for adapter
http://www.winguides.com/registry/display.php/280/
4. Try with Outbound mail scanning disabled
5. Enable transport logging to diagnose
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How to Enable Transport Logging
http://support.microsoft.com/default.aspx?scid=kb;en-us;Q300479
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HKEY LOCAL
MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\EnablePMTUBHDetec
t DWORD 1
HKEY LOCAL
MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\EnablePMTUDiscove
ry DWORD 1
This will allow windows XP to automatically adjust its MTU packet size to
what is required so that packets are not fragmented along the way to your
SMTP server.
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increasing the timeout time in Outlook
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To activate this fix, follow these steps:
1. Quit Outlook.
2.Click Start, and then click Run.
3.In the Open box, type regedit, and then click
OK.
4.Locate, and then click to select the following
registry key:
HKEY CURRENT USER\Software\Microsoft\Office\Outlook
5.After you select the key that is specified in
step 4, point to New on the Edit menu, and then click
DWORD.
6.Type UseInetcommCS, and then press ENTER.
7.Right-click UseInetcommCS, and then click Modify.
8.In the Value data box, type 1, and then click OK.
9.On the File menu, click Exit to quit Registry Editor
Peter Scott
