I want to know whether or not Postfix: The Definitive Guide ( https://www.oreilly.com/library/view/postfix-the-definitive/0596002122/) is outdated. It was published in 2003. How much has Postfix changed since then? Is there content in this book that is depreciated and no longer valid? If so, I will just stick with studying the documentation on postfix.org.
Kind regards, Travis Bean
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