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Exchange is sending out mass emails, how do i track down which pc on network that is doing this?

I have an Exchange Server 2000 that is sending out mass emails.  We got blacklisted from several ISP's, so now we use a company called dyndns to use as a smart host and send email through it.  Only problem is that we have to pay them a small fee per 300 messages a day.  We bought 4 to allow 1200 emails aday go out, "which is way more than enough"  We keep sending out way more than 1200 a day due to a pc on the network that is infected and mass mailing spam out, which probably caused the blacklist in the first place.  My Question is how do i go into exchange and find out who is to blame, or is there a setting in exchange to block mass emails from ever leaving us?
Email ServersExchangeMicrosoft Server OS

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8/22/2022 - Mon