Exchange 2007 sending large amounts of data

My firewall is showing large amounts of data per data being sent out from the exchange server.  Is there a good way to determine what is doing this?  
DwciAsked:
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rr1968Connect With a Mentor Commented:
Here is a nice article, that shows how relaying works:
http://www.petri.co.il/authenticated-or-anonymous-smtp-relay-with-exchange-2007.htm
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FarWestCommented:
what is your firewall, is it ISA?
first make sure that local users are not accessing the exchange via firewall,
second check firewall packets log for destinations, and check if there is a single destination IP used, and weather it is external or internal
good luck
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rr1968Commented:
You can check the "Queue viewer" tool on EMC to check if there are large number.
Also you can increase the SMTP logging and review the logs to see if any particular user account or WS is compromised.
http://exchangepedia.com/2007/05/exchange-server-2007-logging-smtp-protocol-activity.html

Also make sure that the hub server is not an open relay
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DwciAuthor Commented:
My firewall is a Sonicwall NSA2400 and it doesn't look like it is going out the firewall to get to the exchange server.  It looks to me like the outbound data is very large from the server.  
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DwciAuthor Commented:
How do I go about making sure it isn't an open relay?
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rr1968Commented:
Open EMC, Expand Server configuration, select the HUB server. At th bottom of th center pane you will have "receive connectors" Right click on each connector and go to "NETWORK" TAB. Check "Receive mail from remote servers...."
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