http://uptime.netcraft.com/up/graph/...calliberty.com
Seeing that your server is running IIS (windows), I highly doubt it has to do with W32NoVarge@mm (or whatever MyDoom is called).
But It has nothing to do with e-mail attacks or spamming anyways. The virus recruits user machines to act as 'zombies' in a DDoS attack.
I think that you can answer the "ethics" question yourself, what exactly IS the point of your post?