Postfix spam

[Peter Rudasingwa <peter.rudasingwa () altechstream rw>]

Hello,

I am being attacked by a lot of spams on my postfix box. What is the 
best way to block them and fix this for good?

It is so bad some of my IPs have been black listed.

Thanks for your help.

--

Best Regards,

Peter R.

***
*