NAME

       smtpd - Simple Mail Transfer Protocol daemon

SYNOPSIS

       smtpd [-dnv] [-D macro=value] [-f file] [-P system]

DESCRIPTION

       smtpd is a Simple Mail Transfer Protocol (SMTP) daemon which can be used as a machine's
       primary mail system.  smtpd can listen on a network interface and handle SMTP
       transactions; it can also be fed messages through the standard sendmail(8) interface.  It
       can relay messages through remote mail transfer agents or store them locally using either
       the mbox or maildir format.  This implementation supports SMTP as defined by RFC 5321 as
       well as several extensions.  A running smtpd can be controlled through smtpctl(8).

       The options are as follows:

            -D macro=value
                   Define macro to be set to value on the command line.  Overrides the definition
                   of macro in the configuration file.

            -d     Do not daemonize.  If this option is specified, smtpd will run in the
                   foreground and log to stderr.

            -f file
                   Specify an alternative configuration file.

            -n     Configtest mode.  Only check the configuration file for validity.

            -P system
                   Pause a specific subsystem at startup.  Normal operation can be resumed using
                   smtpctl(8).  This option can be used multiple times.  The accepted values are:

                 mda    Do not schedule local deliveries.

                 mta    Do not schedule remote transfers.

                 smtp   Do not listen on SMTP sockets.

            -v     Produce more verbose output.

            -T trace
                   Enables real-time tracing at startup.  Normal operation can be resumed using
                   smtpctl(8).  This option can be used multiple times.  The accepted values are:

                 •      imsg

                 •      io

                 •      smtp (incoming sessions)

                 •      filters

                 •      transfer (outgoing sessions)

                 •      bounce

                 •      scheduler

                 •      expand (aliases/virtual/forward expansion)

                 •      lookup (user/credentials lookups)

                 •      stat

                 •      rules (matched by incoming sessions)

                 •      mproc

                 •      all

FILES

            /etc/mailname
                   Alternate server name to use.

            /etc/smtpd.conf
                   Default smtpd configuration file.

            /var/run/smtpd.sock
                   Ux -domain socket used for communication with smtpctl(8).

SEE ALSO

       smtpd.conf(5), mailwrapper(8), smtpctl(8)

STANDARDS

       Rs %A J. Klensin %D October 2008 %R RFC 5321 %T Simple Mail Transfer Protocol Re

HISTORY

       The smtpd program first appeared in OpenBSD 4.6.

                                    $Mdocdate: March 13 2014 $                           SMTPD(8)