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NAME | SYNOPSIS | DESCRIPTION | FILES | SEE ALSO | STANDARDS | HISTORY | COLOPHON |
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SMTPD(8) System Manager's Manual SMTPD(8)
smtpd — Simple Mail Transfer Protocol (SMTP) daemon
smtpd [-dFhnv] [-D macro=value] [-f file] [-P system] [-T trace]
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 Do not daemonize. If this option is specified, smtpd will
run in the foreground and log to syslogd(8).
-f file
Specify an alternative configuration file.
-h Display version and usage.
-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.
-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
-v Produce more verbose output.
/etc/mail/mailname Alternate server name to use.
/etc/mail/smtpd.conf Default smtpd configuration file.
/var/run/smtpd.sock Unix-domain socket used for communication
with smtpctl(8).
/var/spool/smtpd/ Spool directories for mail during
processing.
~/.forward User email forwarding information.
forward(5), smtpd.conf(5), mailwrapper(8), smtpctl(8)
J. Klensin, Simple Mail Transfer Protocol, RFC 5321, October 2008.
The smtpd program first appeared in OpenBSD 4.6.
This page is part of the OpenSMTPD (a FREE implementation of the
server-side SMTP protocol) project. Information about the project
can be found at https://www.opensmtpd.org/. If you have a bug
report for this manual page, see
⟨https://github.com/OpenSMTPD/OpenSMTPD/issues⟩. This page was
obtained from the project's upstream Git repository
⟨https://github.com/OpenSMTPD/OpenSMTPD.git⟩ on 2025-08-11. (At
that time, the date of the most recent commit that was found in
the repository was 2025-08-02.) If you discover any rendering
problems in this HTML version of the page, or you believe there is
a better or more up-to-date source for the page, or you have
corrections or improvements to the information in this COLOPHON
(which is not part of the original manual page), send a mail to
[email protected]
GNU March 2, 2023 SMTPD(8)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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