[ale] got hacked

[mailinglists at synban.com (Emil P. Man)]

alers,

okay I am so embarassed to come to you guys with this, but I got hacked 
:( Secure OS, bad Sysadmin from my part. I was running some tests on my 
postfix MTA and just glanced at the logs. I became a spam relay for sure :(
now the question is, what do i do? I need to secure this box, amd I 
would like to know if you guys have seen a howto on securing your box so 
it doesn't get turned into a spam box like mine did :(

emil