I've been looking around for information on what I might be able to do in order to slow spammers down and one of the things which has always worked on assp is the delaying/greylisting feature.

I wanted to add this to zimbra 8.0.6 but I can't seem to find information which appears to be current. I don't want to go installing all kinds of things that aren't needed because 8.0.6 might already have certain things installed for example. However, I can't find a specific document for 8.0.6 either which clearly explains what I need to do.

So.. help