No. If you are not running the AV/AS services, then the system does not learn, and does not do any automatic filtering. You have to continue to manually press the Junk button.
However, if you have an AV/AS server in front of the Zimbra server, and there is a method for passing messages to that so that it can learn from messages, then you can write scripts that will go into people's Junk folders and forward those messages onto the spam server for learning.
This is what we are testing right now.
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Freddie
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