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I have a few users, who are also Blackberry users, that occasionally have duplicate emails generated from their "mailbox". I put mailbox in quotes because I'm not exactly sure where the duplicates are created.

One of these users is in non-cached mode, and the other is in cached mode, and both experience the problem. In fact, the non-cached mode user was originally experiencing the problem while in cached mode, and I made the switch a few weeks ago to attempt to solve the problem. Today I discovered the issue still exists.

I'm not sure if the fact that they are blackberry users could be causing the problem at all. I don't see how, but felt I should mention it anyway.

Does anyone have ideas on how I might begin to troubleshoot this? I can see in the non-cached user's mailbox "Sent Items" that the message was sent only once. I confirmed the message does not state that there was a conflict and in fact that makes sense because they are in non-cached mode.

On the server, we have a mail journaling feature turned on for our third-party mail archiving system, and I can see that that system sees two sent messages. And likewise, the recipient does in fact have two messages in their inbox with consecutive message IDs 071A86592516664795116E8F9AD078AA03C80EA5@xxx.xxx.com and 071A86592516664795116E8F9AD078AA03C80EA6@xxx.xxx.com.

It would seem to me that the duplicates are generated on the client, but is there a way to tell for sure?

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I assume this is only happening w/ messages sent to external addresses? I'd turn up the level of detail in the logs and see if you can see anything there. If you've got two messages getting to the recipient, what do the IIS logs show? –  Ward Oct 16 '09 at 17:35
    
This occurs both internally and externally. Are there particular logs I should use? I assume you mean the diagnostics on the server within ESM, but is there anything else I should look at? –  Ken Pespisa Oct 17 '09 at 1:52

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