Microsoft Exchange Message Tracking

I just turned on MS Exchange 2000 message tracking. We keep having our IP banned from AOL.com and Roadrunner, and I suspect there is some sort of malicious spamming software that got into the building somehow and I’m trying to track it down. Is there any way besides MS Exchange message tracking to track outgoing mail – something that might have been on by default or some log somewhere that I might have overlooked. I wanna track this down ASAP and a log that I started 15 minutes ago isn’t all that helpful. Any thoughts/suggestions?