how to find spam source?

[jackc]

One client's account is sending spam, how do I find which script or method is used to send the spam?
thanks

 

[deja_wu]

One client's account is sending spam, how do I find which script or method is used to send the spam?
thanks

i have same problem on my server now but i can not find this sender account.he is using different mail accounts in the sender script but i need this hosting account name in directadmin.i checked bandwiths but everything normal.i am waiting your urgent helps.

Thanks for replys