web/app hosting:protecting yourself

[Littlefield, Tyler]

hello all:
I had a quick question. I am looking at doing some app hosting for some 
specific apps, where the user will modify their service and host it with 
me. I can impose resource limitations pretty easily, but I'd like to 
know how hosts handle traffic control.
For example, lets say my user (bob) gets an account and then sends 5000 
emails out through an open relay. I might get a message about this.
Since monitoring network traffic is not practical (and breaks a ton of 
privacy issues), what sorts of solutions do people have for handling 
this sort of thing? How do hosts insure that users are on good behavior?

I would like to do this in such a wa y that: I am protected and my 
users' privacy is not shattered.

Thanks,

-- 
Take care,
Ty
http://tds-solutions.net
He that will not reason is a bigot; he that cannot reason is a fool; he that dares not reason is a slave.