An Excellent Introduction to Mail Servers,
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This review is from: Postfix: The Definitive Guide (Paperback)
Even if you decide not to use Postfix and opt for a different mail server this is an excellent introduction into mail servers and how email works as well as introducing all the concepts you would expect, protecting your mail server from hacking and avoiding vulnerabilities aswell as Spam email. This book is well written and easy to read for such a complicated subject, although some knowledge of Unix operating systems is required to understand some of the concepts.