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Outlook 2007 users receiving duplicate messages

Posted on 2013-01-26
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Last Modified: 2013-01-26
We are running Windows server 2003 and exchange 2003. I am on a navy ship so out to sea we have times of extreme latency between our ISP and the ship. During these times. Certain users are receiving messages more than once. We are trying to determine whether or not is is an issue with exchange or if it is an issue with the connection with our ISP.

Thanks in advance for any help.
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Question by:Josef Al-Chacar
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by:John Hurst
ID: 38822930
Exchange generally does not cause duplicate messages.

I assume from your post that you have access to Exchange. Look in the Exchange logs for any duplicate messages and see if Exchange received the message twice. It might not have wrapped up the first receive (extreme latency) when it thought the same message was there to receive again. Logs should help you here.

.... Thinkpads_User
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by:Josef Al-Chacar
ID: 38822954
Yeah the messages that the users are receiving duplicates of are are showing up more than once on exchange.
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by:Josef Al-Chacar
ID: 38822985
SMTP uses a TCP connection. Which verifies that the data is sent properly, if no it retransmits it. Could it be that the the distant end (ISP) never receives the verifying bit so it retransmits the entire message again??

Thanks
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John Hurst earned 500 total points
ID: 38822999
Could it be that the the distant end (ISP) never receives the verifying bit so it retransmits the entire message again??

Yes, I think that must be what is happening. That Exchange has it twice says Outlook is not the problem.

My own ISP had server/disk problems a while back that cause their mail system to get out of whack and I would get duplicate emails (fixed, of course).

So I think that the distant, slow and high latency issue are behind your problems. Given the circumstances, you probably have to live with it.

.... Thinkpads_User
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by:Josef Al-Chacar
ID: 38823040
That's what i was thinking thank you for verifying that. Just needed to bounce it off of someone.


Thanks again for the help!!
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Expert Comment

by:John Hurst
ID: 38823043
You are most welcome and I was really happy to help you (and people serving at sea).

Cheers, .... Thinkpads_User
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