exim being hijacked!

Hi,
I just received a spam report from my hosting company, originating from my server. This is one of the (in)famous nigerian type scam emails.

How do they break into my mail server (exim). I don't have any users on the server besides myself. How can I check what's going on.

Running RH/exim/WHM.

Thanks in advace. Not looking to get black-listed all over the internet.

 

 

 

 

Top