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Outlook 2007 users receiving duplicate messages

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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Josef Al-Chacar
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Josef Al-Chacar
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1 Solution
 
John HurstBusiness Consultant (Owner)Commented:
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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Josef Al-ChacarAuthor Commented:
Yeah the messages that the users are receiving duplicates of are are showing up more than once on exchange.
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Josef Al-ChacarAuthor Commented:
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 HurstBusiness Consultant (Owner)Commented:
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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Josef Al-ChacarAuthor Commented:
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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John HurstBusiness Consultant (Owner)Commented:
You are most welcome and I was really happy to help you (and people serving at sea).

Cheers, .... Thinkpads_User
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