As an Internet professional I have many email addresses for different uses and get lots of related emails (some SPAM, mainly HAM though!). In recent weeks though I have seen an explosion in SPAM coming from eastern Europe and Russia. I have finally decided to configure Spam Assassin to kill that SPAM.
The first thing I did was to update the RBL (Blacklists) in /etc/postfix/main.cf to use: zen.spamhaus.org. this replaced the two now non functional RBL lists I had in there.