troubleshooting Question

NDR Attack in Exchange 2003 mailbox

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derekruf asked on
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I have an Exchange 2003 Mailbox that is filling up with NDR's. The server is not an open relay, recipient filtering is turned on. All NDR's appear to be generated from our server. I believe spammers are using the users email account to send Spam. The recipents servers are sending back NDR's to our server and then being passed on to the users mailbox.
Please HELP!! Thanks
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