Exchange Splitting Message Envelope

Hello
Our company has an archiving solution that "appears" to be archiving duplicate emails sent from an Exchange 2000. I say "appears" because upon checking more closely the message IDs are unique even though the message headers "appear" to be the same except for the message IDs.
The Logs in our inbound message router shows 2 email envelope headers with different recipients on each as if the original message was being "split" by Exchange. I Googled and found some information that states that Exchange does split messages when different filtering options are applied based on group membership.
Is there a setting in Exchange that does this ? but more importantly how can I pin point and prove where the message is being "split"? Exchange folks say it's the IMR and vice versa.
All comments welcome.
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mechanicus01Asked:
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NenadicConnect With a Mentor Commented:
A bit stumped now. Any forwarding set on these mailboxes perhaps?
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NenadicCommented:
Hi mechanicus01,

Are you able to provide some more information:
- What product do you use for archiving?
- How is archiving applied? Per database or through an appliance or something more customised?
- Is E2000 the only Exchange in the environment? How many servers (and of which version) do you have?

Thank you.
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mechanicus01Author Commented:
Hi Nenadic

-We are using a Linux based archiving appliance and it is working fine.
-Archiving is set on the
I'm trying to figure out why Exchange is splitting message headers and under which circumstance would it?'

To illustrate the trafic flow
Exchange => IMR Incoming Message Relay => Mailstore
Journaling set on the IMR which feeds the archiving appliance.

The logs from the IMR shows 3 message envelopes each with different recipients for what the Exchange user says was 1 email sent. The Archiving appliance show 3 messages archived.
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NenadicCommented:
The journaling has to track what happens with each affected sender or recipient. So, separate envelopes are OK. Separate messages should only occur if you have different journaling targets - otherwise a single one should suffice.
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mechanicus01Author Commented:
Hi Nenadic

What do you mean by "journaling has to track what happened with each..."
Why are separate envelopes Ok when only 1 single message was sent? What do you think caused the envelope to separate the recipients?

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NenadicCommented:
Looking at the final destination of each recipient and the journaling rules should provide answers. How many journal destinations do you have and how many policies are there?
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mechanicus01Author Commented:
1 journalmailbox, 1 policy
Policy captures all (*) incoming email at the IMR and sends them to the journalmailbox where the Archiving Appliance retrieves from.
What would be causing Exchange to "split" email envelopes, you think?

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mechanicus01Author Commented:
The headers don't indicate a FWD...
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NenadicCommented:
Are there any configured on the mailboxes themselves? They wouldn't show as FWD in headers.
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mechanicus01Author Commented:
Looks like there were forwarders on those accounts, thanks ...
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