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exchange 2003 and spam at network

Hi Experts
I need your helps immediattly.

I have a exchange 2003 server on my network . I think i have a spam mail in my network.I get every day undelivered mail retorned to sender mail.
I think one of our mail box try to send a mail .But i do not know i can i find it who sends this mail from my network.
please give me ideas or solutions.

Thanks
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Alan Hardisty
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apollo-13

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i get every day Mail Delivery System MAILER-DAEMON@  and subcejt : Undelivered Mail Returned to Sender.

I think ,one of my user sent mail and the otherside server respons like above. But who?

and every returned mail diffrent mail address i see
in this email a link from this server. I cocntacted with them and they say i try to send spam mail and they block my mail.

mx.mail.domain[ip] said: 550 spam message     rejected.

But how i find who send from us this mail?
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hi alan
Have you looked in your outbound queue on the server? where can i see that?
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yes there is 10 queue mail
but if i click no info
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no i cant see
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Hi tmoore , But my problem is .one of my user sends a mail and destination  server send me back with NDR mail. This NDR info not from my server ,from other side server.

I just look at that how can i find my user who sends that mail
i think i found it. There is a mail distiribution group ,i think this send mail to other server.

can i disable it somehow?