I know that spam is a big topic and I have read everything there is on the forums but I am a bit of a novice in this area so bear with me. I have had a zimbra server up and running for a small private school for the past 3 months. Spam has been greatly reduced from what they are used to but how can an email get thru with the F word in the subject line? at first I had just whatever was default setup, I have since reduced the numbers from 75/33 to 30/15. I enabled SPF and installed razor. I followed one of the guides in the wiki but they were written several versions ago. I am running ubuntu 8.04 with 5.09 installed.
I dont think I want to use greylisting so what are the best recommendations and easiest way to implement them? I can follow a guide well enough. Any ideas?