Provided by: smtpd_2.0-8_i386
smtpd - SMTP message storing daemon
smtpd[-cchrootdir][-dspooldir] [ -u user ] [ -g group ] [ -m myname ]
[ -s maxsize ] [ -H ] [ -P ] [ -D ] [ -L ]
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.
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.
Specify a different spool directory within the chrooted subtree.
The default is ".", making smtpd spool files to the directory it
chroots itself to.
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.
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.
Specify the hostname the daemon should announce itself as. the
default is whatever gethostname() returns.
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
-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.
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
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
juniperd(8), smtpfwdd(8), smtpd_address_check(5)
Obtuse Systems Corporation
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
July 19, 1999 smtpd(8)