NAME

smtpd - receive incoming SMTP messages

SYNOPSIS

smtpd [ -n ] [ -H helohost ] [ -h thishost ] [ -L loadlim  ]
[ -l maxprocs ]

DESCRIPTION

smtpd is a daemon that normally runs while in multi-user mode, waiting for requests from remote hosts to send mail. smtpd listens for these requests on any TLI-based network for which the SMTP service is defined (to netdir_getbyname(3)). Normally, this will only be the ``tcp'' network. As requests are received, smtpd will fork off child smtpd processes to handle each individual SMTP transaction. The options to smtpd and their meanings are as follows:

-n Do not create smtpsched processes to process the incoming mail. Rely on the hourly cron(1) invocation of smtpsched instead.

-H helohost This option can be used to specify the  name  to
            be  used  for  the host in the initial SMTP HELO
            message.  If it is not specified, the name  used
            in  the HELO message defaults to the system node
            name.

-h thishost Specify the network name to  be  prepended  onto
            the sender path in the From line of the message.
            This option is passed through  to  the  fromsmtp
            program.

-L loadlim Specify the maximum load at which smtpd will create children. If this option is not specified, there is no limit to the load at which children may run. The load is determined by reading the kernel variable avenrun.

-l maxprocs This option  is  used  to  specify  the  maximum
            number  of children of smtpd that can be running
            at once.  Each child handles one SMTP  conversa-
            tion.  If this option is not specified, there is
            no limit to the number of children that may run.
            Mail  that  is successfully received is piped to
            the fromsmtp command, which in turn delivers the
            mail  by  piping  it  to  rmail.   A  log of all
            smtpd's  activities  is   kept   in   the   file
            /var/spool/smtpq/LOG.

FILES

/dev/kmem To get the current machine load (avenrun)

/etc/services            List  of  TCP/UDP  services   (SMTP
                         should be 25/tcp)

/etc/net/*/services List of other TLI networks' services

/usr/lib/mail/surrcmd/fromsmtp

                         Where incoming mail is piped to

/var/spool/smtpq/LOG     Log of smtpd transactions

SEE ALSO

cron(1M), fromsmtp(1M), smtp(1M)