Setting up SpamAssassin for MailServer in Windows is a tricky thing to do.
Documentation on the subject is sparse and Google searches turn up very old posts or posts that point you in the wrong direction. Fortunately once you know the setup process, it is fairly straightforward and easy to do.
There are several different versions of SpamAssassin out there. The main branch requires you to download the source code, then download perl to compile the source as binaries. Fortunately in our case, there is already versions compiled for Windows in the form of SAWin32.
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