Sendmail Operation Guide

Basic installation
    Compiling sendmail
    Configuration files
    Details of installation files

Normal operations
    The system log
    Dumping state
    The mail queue
    Disk-based connection information
    The service switch
    The alias database
    User information database
    Per-user forwarding (.forward files)
    Special header lines
    IDENT protocol support

Arguments
    Queue interval
    Daemon mode
    Forcing the queue
    Debugging
    Changing the values of options
    Trying a different configuration file
    Logging traffic
    Testing configuration files
    Persistent host status information

Tuning
    Timeouts
    Forking during queue runs
    Queue priorities
    Load limiting
    Delivery mode
    Log level
    File modes
    Connection caching
    Name server access
    Moving the per-user forward files
    Free space
    Maximum message size
    Privacy flags
    Send to me too

The configuration file
    R and S: rewriting rules
    D: define macro
    C and F: define classes
    M: define mailer
    H: define header
    O: set option
    P: precedence definitions
    V: configuration version level
    K: key file declaration
    The user database

Other configuration
    Parameters in BuildTools/OS/$oscf
    Parameters in src/conf.h
    Configuration in src/conf.c
    Configuration in src/daemon.c

Queue file formats

Summary of support files