Qmail Quickstarter: Install, Set Up and Run your own Email Server. A fast-paced and easy-to-follow, step-by-step guide that gets you up and running qu Tychy

This book starts with setting up a qmail server and takes you through virtualization, filtering, and other advanced features like hosting multiple domains, mailing lists, and SSL Encryption. Finally, it discusses the log files and how to make qmail work faster.Qmail is a secure, reliable, efficient, simple message transfer agent. It is designed for typical Internet-connected UNIX hosts. Qmail is the second most common SMTP server on the Internet, and has by far the fastest growth of any SMTP server. Qmail's straight-paper-path philosophy guarantees that a message, once accepted into the system, will never be lost. Qmail also optionally supports maildir, a new, super-reliable user mailbox format. Spis treści: Qmail Quickstarter Table of Contents Qmail Quickstarter Credits About the Author About the Reviewer Preface What This Book Covers What You Need for This Book Who This Book is For Conventions Reader Feedback Customer Support Downloading the Example Code for the Book Errata Questions 1. Basic Qmail The Minimum Qmail System Compiling and Installing Preparing the System Compiling and Installing the Necessary Binaries Creating the Basic Configuration Files Creating the Necessary Minimum Account Aliases Default Mail Delivery Basic Configuration Simple Execution qmail-start qmail-smtpd Administrative Conveniences About Patches ucspi-tcp and daemontools Installation Using tcpserver Using svscan Logging The Overall Structure of Qmail Summary 2. Getting Email into the Queue qmail-queue and the Qmail Queue The qmail-inject and sendmail Interfaces qmail-smtpd and the QMAILQUEUE Patch Accepting or Rejecting Email RELAYCLIENT and Authentication tcprules POP-before-SMTP SMTP-AUTH The QMAILQUEUE Patch Other Mail Protocols Quick Mail Transfer Protocol (QMTP) Old-Fashioned Mail Injection Protocol (OFMIP) Summary 3. Getting Email Out of the Queue qmail-send and the Qmail Queue Delivering Email Locally The Default .qmail Files Forwards Maildirs and mboxes Pipes and Programs Supporting .forward Files Users The virtualdomains File Defined Users: The users/assign File Aliases Extensions Delivering Email Remotely How It Normally Works Static Routes Authentication Summary 4. Storing and Retrieving Email Popular Storage Formats Reliability Speed Reading Marking Deleting Delivery Searching On-Disk Efficiency The POP3 and IMAP Protocols Protocol and Server Selection qmail-pop3d Server Setup The Checkpassword Interface Installing the checkpassword Program Running with tcpserver Webmail Summary 5. Virtualization Generic Virtualization Framework Power of the virtualdomains File Basic Virtual Domains The Path of an Email Non-Virtual Non-System Users User-Management Problem in Assisted Virtual Domains Popular Solutions: vpopmail and VMailMgr Consequences for Other Services Good Reasons to Use Multiple Installations How to Set Up Multiple Qmail Installations Hiding Multiple Queues from the User Summary 6. Filtering Basic Filtering Architecture Sending Mail Without a Queue Blocking Viruses Heavyweight Filtering Lightweight Filtering Stopping Spam from Getting In Sender Validation SPF DomainKeys Identifying Spam Lightweight Domain Name System Black-Lists Checking for SMTP Violations Pattern Matching Heavyweight Bayesian and other Machine-Learning Techniques Ensemble Identification Quarantines and Challenges Mistakes Stopping Spam from Getting Out Sender Restrictions Bounce-Back Spam Recipient Validation Recipient Validation is Insufficient Summary 7. Advanced Features SSL Encryption Patch vs. Wrapper When Receiving Email When Sending Email Mailing Lists Lightweight vs. Heavyweight Speed vs. Size Member Management Efficiency under Load Variable Envelope Return Path Integration with Qmail Web Interface Summary 8. Administration, Optimization, and Monitoring The Log Files The Basic qmail-smtpd Log Expanding the qmail-smtpd Log The Basic qmail-send Log Basic Analysis qmailanalog Identifying Problems Making It Faster Calculating Your Limits Finding Bottlenecks Concurrency Resource Starvation DNS Filesystem Silly Qmail Syndrome Summary Index