We have not upgraded in a while and I am about to upgrade from 4.5.4 to 4.5.10. Back when we were at 4.5.1 I followed a wiki and a thread on how to improve anti spam and many of these changes helped. I looked at the following Wiki and it has been updated since I last followed it.
Improving Anti-spam system - Zimbra :: Wiki
I was wondering if there were any major changes I need to look out for in postfix and amavisd when performing this upgrade? I have the files I changed saved off but it has been a while since I upgraded and I know many improvements have been made.