[BlueOnyx:01513] Slammed with Spammer

[Steve Davis]

Having an issue with an old enemy on a new BO box.

net.tw,
gov.tw
org.tw
net.tw
com.tw

take your pick.

Some how, they must know one of the emails userid and password on the  
box and are sending 4000 - 5000 spams per hour into my mail queue.

I have turned off PopBeforeSMTP, so probably not sending email out.  
Probably.

How do I tell which account is being used to connect.

Any other suggestion of course is always appreciated.

Steve