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Exchange 2003 Duplicate messages - Routing problem ?

I'm running SBS2003 and my exchange routing seems a little queer.

If a person sends a message to 10 different people at our company then each recipient receives it 10 times !! If sent to 5 recipients then all 5 people receive the message 5 times - I'm new to exchange and simply set it up using the wizards, have I missed something really obvious ?, any help appreciated as our mail boxes are filling up with duplicate messages.
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ubiquitas
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anyone ???
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It sounds like Outlook is getting it's knickers in a twist. Have you checked via owa if the same thing happens?
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InteraX
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Thanks. I have message tracking on.

I just did a test and sent a message to the administrator & 1 other person. I checked the administrator email via OWA and the message is there twice.

In the message tracking it shows the server as having received 2 identical emails from me, and delivered each message only once to each recipient.  Any more ideas?, definitly seems like the problem is with exchange and not Outlook to me.
Can you post the full headers of these 2 mails?
/RID
OK, little further investigation has revealed what is happening. We are set up to collect our company mail from a POP account with our ISP, i.e.  *@ourdomain.co.uk

It seems that the ISP creates duplicates of the message (1 for every recipient@ourdomain.co.uk) which our exchange server then downloads and dutifully sends out to all the recipients.

So my solution I suppose is either

1. Get exchange to remove duplicate messages (if this is even possible)
2. Get ISP to change MX records to point direct to our Exchange Server

I guess my question now is which of the above is the best solution, I suspect no. 2 though I've no idea how to set up exchange to deal with this
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