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)