Travis Bean via Postfix-users:
> 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 outdated.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.
There is also "The Postfix Book" by Ralf and Patrick from 2005.
Most things described in those books should still work (SMTP has
not changed fundamentally). However, the Internet has evolved and
many things have been added to Postfix that these books could not
cover.
Michael Lucas's "Run Your Own Mail Server" book covers the protocols
of today, including SPF, DKIM, TLS with Let's Encrypt certificates,
and so on. Consider it a companion to the earlier books.
Wietse
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