Ubuntu manuals

Provided by: smtpd_2.0-8.1_i386

NAME

       smtpd - SMTP message storing daemon

SYNOPSIS

       smtpd[-cchrootdir][-dspooldir]  [ -u user ] [ -g group ] [  -m myname ]
       [ -s maxsize ] [ -H ] [ -P ] [ -D ] [ -L ]

DESCRIPTION

       The smtpd daemon talks the Simple Mail Transfer  Protocol  (SMTP)  with
       other SMTP daemons to receive mail from them, and saves it into a spool
       directory for later processing. It is the  store  portion  of  an  SMTP
       store  and  foward  proxy.  The symbiotic companion program smtpfwdd is
       used to forward the spooled mail on to its eventual destination.  smtpd
       is invoked from a super-server such as inetd or juniperd.

OPTIONS

       -c chrootdir
              Specify  a  different directory to chroot to on startup than the
              default spool directory (/var/spool/smtpd).

              This directory should be readable and writable only to the  user
              that smtpd runs as.

       -d spooldir
              Specify a different spool directory within the chrooted subtree.
              The default is ".", making smtpd spool files to the directory it
              chroots itself to.

       -u user
              Specify  a user to run as. This user must not be root but should
              normally be a user that is able to run sendmail and use  the  -f
              option to specify the sender of a mail message.

       -g group
              Specify a group to run as. Same as user above.

       -H     Disable  host  checking against the DNS. By default smtpd checks
              and will complain in the syslogs if the  DNS  information  on  a
              host seems to indicate a possible spoof or misconfiguration.

       -m myname
              Specify  the  hostname the daemon should announce itself as. the
              default is whatever gethostname() returns.

       -s maxsize
              Specify (in bytes) the maximum size of mail message  the  daemon
              should accept. The default is not to have a maximum size.

       -P     Enable  paranoid mode of operation, in this mode connections are
              dropped from any client feeding  smtpd  a  suspicious  hostname,
              FROM:,  or  RCPT:  line  containing  characters indicative of an
              attempt to do something evil, or any message headers that aren’t
              8bit  clean.   The  default  is  to  log  such  occuurances  and
              substitute for  the  offending  characters,  but  not  drop  the
              connection.

       -D     Tells  smtpd  to  run  as  a  daemon, listening on port 25.  The
              default is not to run as a daemon (i.e. it  should  normally  be
              spawned from juniperd or inetd.

       -L     Suppress children in daemon mode (above) from doing an openlog()
              call. This means your syslogs won’t have pid information, but is
              useful  if you don’t want to have to set up your chroot jail for
              smtpd in a manner that an openlog() call will work in it.

BUGS

       Since sendmail is not normally running as a daemon when
              using smtpd and smtpfwdd, one  must  use  cron  to  periodically
              invoke  sendmail  -q  so  that  queued  messages are retried for
              eventual delivery.

NOTES

       smtpd and smtpfwdd are also available  separately  from  Juniper  under
       quite friendly copyright terms.  It can be obtained using anonymous ftp
       in the directory ftp://ftp.obtuse.com/pub/smtpd

SEE ALSO

       juniperd(8), smtpfwdd(8), smtpd_address_check(5)

AUTHOR

       Obtuse Systems Corporation

LICENCE

       All rights reserved Use of the Juniper software is covered by the terms
       and  conditions  of the Juniper License Agreement.  If you do not agree
       to and accept the terms of this agreement then  you  may  not  use  the
       software.

                                 July 19, 1999                        smtpd(8)