1. Chapter 1 Getting Started

   1. Introduction

   2. Downloading the Latest Release

   3. Installing sendmail

   4. Compiling sendmail to Use LDAP

   5. Adding the regex Map Type to sendmail

   6. Compiling sendmail with SASL Support

   7. Compiling sendmail with STARTTLS Support

   8. Compiling in STARTTLS File Paths

   9. Building a sendmail Configuration

   10. Testing a New Configuration

   11. Logging sendmail

2. Chapter 2 Delivery and Forwarding

   1. Introduction

   2. Accepting Mail for Other Hosts

   3. Fixing the Alias0 Missing Map Error and Creating Simple Aliases

   4. Reading Aliases via LDAP

   5. Configuring Red Hat 7.3 to Read Aliases from a NIS Server

   6. Configuring Solaris 8 to Read Aliases from a NIS Server

   7. Forwarding to an External Address

   8. Creating Mailing Lists

   9. Migrating Ex-Users to New Addresses

   10. Delivering Mail to a Program

   11. Using Program Names in Mailing Lists

   12. Allowing Nonlogin Users to Forward to Programs

   13. Fixing a .forward Loop

   14. Enabling the User Database

3. Chapter 3 Relaying

   1. Introduction

   2. Passing All Mail to a Relay

   3. Passing Outbound Mail to a Relay

   4. Passing Local Mail to a Mail Hub

   5. Passing Apparently Local Mail to a Relay

   6. Passing UUCP Mail to a Relay

   7. Relaying Mail for All Hosts in a Domain

   8. Relaying Mail for Individual Hosts

   9. Configuring Relaying on a Mail Exchanger

   10. Loading Class $=R via LDAP

   11. Relaying Only Outbound Mail

4. Chapter 4 Masquerading

   1. Introduction

   2. Adding Domains to All Sender Addresses

   3. Masquerading the Sender Hostname

   4. Eliminating Masquerading for the Local Mailer

   5. Forcing Masquerading of Local Mail

   6. Masquerading Recipient Addresses

   7. Masquerading at the Relay Host

   8. Limiting Masquerading

   9. Masquerading All Hosts in a Domain

   10. Masquerading Most of the Hosts in a Domain

   11. Masquerading the Envelope Address

   12. Rewriting the From Address with the genericstable

   13. Rewriting Sender Addresses for an Entire Domain

   14. Masquerading with LDAP

   15. Reading the genericstable via LDAP

5. Chapter 5 Routing Mail

   1. Introduction

   2. Routing Mail to Special Purpose Mailers

   3. Sending Error Messages from the mailertable

   4. Disabling MX Processing to Avoid Loops

   5. Routing Mail for Local Delivery

   6. Reading the mailertable via LDAP

   7. Routing Mail for Individual Virtual Hosts

   8. Routing Mail for Entire Virtual Domains

   9. Reading the virtusertable via LDAP

   10. Routing Mail with LDAP

   11. Using LDAP Routing with Masquerading

6. Chapter 6 Controlling Spam

   1. Introduction

   2. Blocking Spam with the access Database

   3. Preventing Local Users from Replying to Spammers

   4. Reading the access Database via LDAP

   5. Using a DNS Blackhole List Service

   6. Building Your Own DNS Blackhole List

   7. Whitelisting Blacklisted Sites

   8. Filtering Local Mail with procmail

   9. Filtering Outbound Mail with procmail

   10. Invoking Special Header Processing

   11. Using Regular Expressions in sendmail

   12. Identifying Local Problem Users

   13. Using MILTER

   14. Bypassing Spam Checks

   15. Enabling Spam Checks on a Per-User Basis

7. Chapter 7 Authenticating with AUTH

   1. Introduction

   2. Offering AUTH Authentication

   3. Authenticating with AUTH

   4. Storing AUTH Credentials in the authinfo File

   5. Limiting Advertised Authentication Mechanisms

   6. Using AUTH to Permit Relaying

   7. Controlling the AUTH= Parameter

   8. Avoiding Double Encryption

   9. Requiring Authentication

   10. Selectively Requiring Authentication

8. Chapter 8 Securing the Mail Transport

   1. Introduction

   2. Building a Private Certificate Authority

   3. Creating a Certificate Request

   4. Signing a Certificate Request

   5. Configuring sendmail for STARTTLS

   6. Relaying Based on the CA

   7. Relaying Based on the Certificate Subject

   8. Requiring Outbound Encryption

   9. Requiring Inbound Encryption

   10. Requiring a Verified Certificate

   11. Requiring TLS for a Recipient

   12. Refusing STARTTLS Service

   13. Selectively Advertising STARTTLS

   14. Requesting Client Certificates

9. Chapter 9 Managing the Queue

   1. Introduction

   2. Creating Multiple Queues

   3. Using qf, df, and xf Subdirectories

   4. Defining Queue Groups

   5. Assigning Recipients to Specific Queues

   6. Using Persistent Queue Runners

   7. Using a Queue Server

   8. Setting Protocol Timers

10. Chapter 10 Securing sendmail

    1. Introduction

    2. Limiting the Number of sendmail Servers

    3. Limiting the Number of Network Accessible Servers

    4. Updating to Close Security Holes

    5. Patching to Close Security Holes

    6. Disabling Delivery to Programs

    7. Controlling Delivery to Programs

    8. Disabling Delivery to Files

    9. Bypassing User .forward Files

    10. Controlling Delivery to Files

    11. Running sendmail Non-Set-User-ID root

    12. Setting a Safe Default User ID

    13. Defining Trusted Users

    14. Identifying the sendmail Administrator

    15. Limiting the SMTP Command Set

    16. Requiring a Valid HELO

    17. Restricting Command-Line Options

    18. Denying DoS Attacks

1. Colophon

Our look is the result of reader comments, our own experimentation, and feedback from distribution channels. Distinctive covers complement our distinctive approach to technical topics, breathing personality and life into potentially dry subjects. The animal on the cover of sendmail Cookbook is a common European bat (Pipistrellus pipistrellus). Pipistrelles are the most common bat in Britain and are abundant throughout Europe and Asia, although they are reportedly endangered in Germany and Austria. Among the world's smallest bats, Pipistrelles have a body length of 35 to 45 millimeters (about 1.5 inches) and a wingspan of 190 to 250 millimeters (about 9 inches). These tiny mammals have a voracious appetite, consuming up to 3,000 insects a night when the weather is warm. Averse to the cold, their behavior during winter months is mostly unknown. There has been a marked decline in the number of pipistrelles due to modern agricultural practices, including the use of insecticides and the illegal disturbance of their habitats by builders. Marlowe Shaeffer was the production editor and proofreader for sendmail Cookbook. Derek Di Matteo was the copyeditor. Reg Aubry, Claire Cloutier, and Emily Quill provided quality control. Jamie Peppard provided production assistance. Tom Dinse wrote the index.

Ellie Volckhausen designed the cover of this book, based on a series design by Edie Freedman. The cover image is a 19th-century engraving from the Dover Pictorial Archive. Emma Colby produced the cover layout with QuarkXPress 4.1 using Adobe's ITC Garamond font.

David Futato designed the interior layout. This book was converted to FrameMaker 5.5.6 by Julie Hawks with a format conversion tool created by Erik Ray, Jason McIntosh, Neil Walls, and Mike Sierra that uses Perl and XML technologies. The text font is Linotype Birka; the heading font is Adobe Myriad Condensed; and the code font is LucasFont's TheSans Mono Condensed. The illustrations that appear in the book were produced by Robert Romano and Jessamyn Read using Macromedia FreeHand 9 and Adobe Photoshop 6. The tip and warning icons were drawn by Christopher Bing. This colophon was written by Marlowe Shaeffer.