title: Basic Spamfilter in Postfix
body: <p>I need a basic configuration in postfix (<em>mail_version = 2.6.6</em>) which can filter spams from any known domain/IP (which are listed in RBL directories). This maybe a duplicate question, but I do not see any effective config options online which will filter spams.</p>
  
  <p><strong>Note:</strong>
  I tried with some configs, but that will filter emails from gmail also.</p>
  
  <p>Thanks in advance.</p>