sendmail Tutorial

1. Introduction:
   • MUAs, MTAs, and MDAs
   • Structure of an Email Message
   • SMTP and the Message Envelope
   • History of sendmail
   • The Mail Queue
   • Aliases and The .forward File
2. sendmail Building and Installation:
   • Why use Berkeley sendmail?
   • Obtaining the Source Code
   • Build-Time Configuration
   • Database Map Support
   • Example site.config.m4
   • Running the Build
3. sendmail Configuration:
   • What does the configuration file do?
   • .cf files vs .mc files
   • The Structure of a .mc File
   • Configuration Variables
   • FEATURE() Macros
   • Masquerading
   • Relaying
   • Database Maps
   • Generating a .cf file from your new .mc file
4. Anti-Spam Facilities:
   • What is "spam"?
   • No Default Relaying
   • Access Control Database
   • Better Checking on Sender Information
5. Running sendmail:
   • Commandline Arguments
   • Starting sendmail