Exchange 2003 SMTP service is cripping clien't internet connection

I  am out of town at the moment and a client reported the inability to send email and that their internet connection is crawling. I know that the issue has to do with the SMTP service because if we stop it everything returns to normal. This server is not used to relay email for users outside the domain. It is not configured for open relay or anything like that. I have enabled logging and will see what it gleans but because in order to have a stable remote connection that I need to troubleshoot this issue I have to disable the smtp service which does not allow me to access the smtp virtual server queue or see what's being logged in real time. I posted here in case anyone has run across this that could give me some ideas of things to try and to be more proactive. Any feedback is appreciated.
J CAsked:
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AnuroopsunddCommented:
1 Can be a virus on some internal machine which is sending lots of mail.
2 many time some internal users send mail to mass customers with big attachments without knowing it.
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J CAuthor Commented:
One of our users did send out a very large attachment to several users but I froze and deleted the emails in the queue
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AnuroopsunddCommented:
great.. so that resolved it.
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J CAuthor Commented:
No, it's not solved. It appears as if they are re-appearing in the queue, the problem remains. I stopped the smtp server and went into the Mailroot>Queue folder to manually delete the e-mails and the folder is empty.  Why are they showing up in the exchange queue but not in that folder? Any suggestions?
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