Versions Covered in This Book

At the time this book went to press, SpamAssassin 2.63 was the latest released version of SpamAssassin and was in wide use. The next -generation release of SpamAssassin, SpamAssassin 3.0, was available for beta-testing and is expected to be released at about the time this book appears in stores. SpamAssassin 3.0 introduces several important new features and changes parts of the Perl API.

Accordingly, this book covers both versions of SpamAssassin. When a topic or setting is specific to one version, I so note it.