Managing anti-spam filtering
The nature and behavior of Exchange anti-spam filtering is quite different from the anti-malware scanner. Spam is annoying but rarely dangerous; however, malware is much more easily identified than spam, so the spam filtering process itself is actually more complex than you might expect.
There are essentially two rather different spam filtering systems that you might encounter in Exchange 2013 deployments: the built-in system, which uses a series of transport agents that aren’t configurable; and the filtering system implemented in EOP, which is much more flexible. Each system requires you to take some action before you can use it:
The built-in filtering system must be enabled on each mailbox server on which you want ...
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