Kyle Dent works as an independent consultant and software developer in the New York metropolitan area. He has designed and implemented various security, network, and web-based applications for technology and financial firms. He also has been working with Postfix in various settings since it was released by IBM in 1998.

• Foreword; Preface; 1. Introduction Postfix Origins and Philosophy Email and the Internet; The Role of Postfix; Postfix Security Additional Information and How to Obtain Postfix; 2. Prerequisites Unix Topics; Email Topics; 3. Postfix Architecture; Postfix Components; How Messages Enter the Postfix System; The Postfix Queue; Mail Delivery; Tracing a Message Through Postfix 4. General Configuration and Administration; Starting Postfix the First Time; Configuration Files; Important Configuration Considerations; Administration; master.cf; Receiving Limits Rewriting Addresses; chroot; Documentation; 5. Queue Management How qmgr Works; Queue Tools; 6. Email and DNS; DNS Overview Email Routing; Postfix and DNS; Common Problems; 7. Local Delivery and POP/IMAP Postfix Delivery Transports; Message Store Formats; Local Delivery; POP and IMAP; Local Mail Transfer Protocol; 8. Hosting Multiple Domains; Shared Domains with System Accounts; Separate Domains with System Accounts; Separate Domains with Virtual Accounts; Separate Message Store Delivery to Commands; 9. Mail Relaying; Backup MX; Transport Maps; Inbound Mail Gateway; Outbound Mail Relay; UUCP, Fax, and Other Deliveries; 10. Mailing Lists; Simple Mailing Lists Mailing-List Managers; 11. Blocking Unsolicited Bulk Email The Nature of Spam; The Problem of Spam; Open Relays Spam Detection; Anti-Spam Actions; Postfix Configuration Client-Detection Rules; Strict Syntax Parameters; Content-Checking; Customized Restriction Classes; Postfix Anti-Spam Example; 12. SASL Authentication; SASL Overview; Postfix and SASL; Configuring Postfix for SASL; Testing Your Authentication Configuration; SMTP Client Authentication; 13. Transport Layer Security; Postfix and TLS; TLS Certificates; 14. Content Filtering; Command-Based Filtering;; Daemon-Based Filtering Other Considerations; 15. External Databases; MySQL LDAP; A. Configuration Parameters; B. Postfix Commands C. Compiling and Installing Postfix; D. Frequently Asked Questions Index

"Excellent book." Information Security Bulletin, September 2004