Hi Everyone

I have noticed in my admin console under "Server Statistics" large peeks under last 48 hours. They are 4 times my normal volume and I am afraid I am being spammed or being used as a relay. Is there a fast way to scan the logs and see if someone is sending extra mail through my server? Or are there some holes I need to check on the server ZCS 6.0.4 / Ubuntu 64 8.0.4