how to control SPAM Mails?

[AMedz]

Huge help pls!!!!!
My current domino R5 server(ver 5.0.6a) are being spammed.
i have exposed my notes server to the internet(meaning it does not run behind the proxy or firewall) in order to use the new cool features of R5 such as the POP3 and IMAP and browsing their mails from any browser(IE or Netscape), so currently this is my setup. Is there a way to control all these SPAM Mails?
HELP PLS......

 

[karate]

Goto Domoni Administration,
-->Click on CONFIGURATION tab
---> click on Configuration
----> click on your Public server, ie ABCD/def_GHJ/Ca
-----> click on Router/SMTP
------> click on SMTP Inbound Controls
-------> Point the Inbound Relay Controls to your server
(web server) only

GOOD LUCK