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SMTPFWDD(8) OpenBSD System Manager's Manual SMTPFWDD(8)
smtpfwdd - Obtuse Systems SMTPFWDD message forwarding daemon
smtpfwdd [-q] [-d spooldir] [-u user] [-g group] [-s mailprog] [-M
maxchildren] [-P poll time]
The smtpfwdd daemon forwards mail messages from a spool directory to
their eventual destinations. It regularly scans the spool directory in
which its symboitic companion program smtpd(8) stores messages and in-
vokes a mail program (such as sendmail(8)) to forward them. It is the
forward portion of an SMTP store and foward proxy. smtpfwdd is a stan-
dalone daemon, usually invoked at system startup.
-d Specify a different spool directory. This should be the same di-
rectory in which smtpd(8) is spooling files (usually
-g Specify a group to run as. Same as user above.
-M Specifies maxchildren as the maximum number of children smtpfwdd
should be allowed to spawn at once when delivering mail. Default
-P specifies a polling interval of polltime seconds indicating how
often the master smtpfwdd process should wake up and check the
spool directory for new mail to forward. Default is 10 seconds.
-q Tell smtpfwdd to be quieter. By default smtpfwdd emits very ver-
bose syslog messages. With this option it will emit one line of
log for each normal message exchange.
-s Specify a different mail program to use to forward mail. The de-
fault is /usr/sbin/sendmail Any replacement must be able to be
invoked in the same manner as sendmail with a -f fromaddress,
followed by one or more destination addresses on the command
-u Specify a user to run as. This user must not be root but should
normally be a user that is able to run sendmail(8) and use the -f
option to specify the sender of a mail message.
smtpd(8), sendmail(8), inetd(8)
Since sendmail(8) is not normally running as a daemon when using smtpd(8)
and smtpfwdd(8), one must use cron to periodically invoke sendmail -q so
that queued messages are retried for eventual delivery, alternatively
sendmail may be run standalone, but not listening to the network if your
version of sendmail supports doing this correctly.
There are many different variations of sendmail. smtpfwdd will check and
pay attention to the exit status of the sendmail processes it invokes,
possibly retrying an invocation of sendmail. If you aren't using real
unadulterated Berkeley sendmail of a recent vintage, you may need to dis-
able the exit status checking at compile time.
sendmail can't handle a . on one line in a message body. This problem is
bypassed in smtpfwdd by giving sendmail the option -oitrue. Again, if you
aren't using genuine sendmail, you may need to disable this at compile
Source: OpenBSD 2.6 man pages. Copyright: Portions are copyrighted by BERKELEY
SOFTWARE DESIGN, INC., The Regents of the University of California, Massachusetts
Institute of Technology, Free Software Foundation, FreeBSD Inc., and others.
(Corrections, notes, and links courtesy of RocketAware.com)
OpenBSD sources for smtpfwdd(8)
Up to: Email Server and Transport Agents - Electronic mail servers including delivery, routing, and transfer agents (MTAs), protocols (SMTP, POP, IMAP, -
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