Provided by: spamassassin_3.1.0a-2ubuntu1_all
spamd - daemonized version of spamassassin
-l, --allow-tell Allow learning/reporting
-c, --create-prefs Create user preferences files
-C path, --configpath=path Path for default config files
--siteconfigpath=path Path for site configs
-d, --daemonize Daemonize
-h, --help Print usage message.
-i [ipaddr], --listen-ip=ipaddr Listen on the IP ipaddr
-p port, --port=port Listen on specified port
-m num, --max-children=num Allow maximum num children
--min-children=num Allow minimum num children
--min-spare=num Lower limit for number of spare children
--max-spare=num Upper limit for number of spare children
--max-conn-per-child=num Maximum connections accepted by child
before it is respawned
--round-robin Use traditional prefork algorithm
--timeout-tcp=secs Connection timeout for client headers
--timeout-child=secs Connection timeout for message checks
-q, --sql-config Enable SQL config (only useful with -x)
-Q, --setuid-with-sql Enable SQL config (only useful with -x,
enables use of -H)
--ldap-config Enable LDAP config (only useful with -x)
--setuid-with-ldap Enable LDAP config (only useful with -x,
enables use of -H)
--virtual-config-dir=dir Enable pattern based Virtual configs
-r pidfile, --pidfile Write the process id to pidfile
-s facility, --syslog=facility Specify the syslog facility
--syslog-socket=type How to connect to syslogd
-u username, --username=username Run as username
-v, --vpopmail Enable vpopmail config
-x, --nouser-config Disable user config files
--auth-ident Use ident to authenticate spamc user
--ident-timeout=timeout Timeout for ident connections
-A host,..., --allowed-ips=..,.. Limit ip addresses which can connect
-D, --debug[=areas] Print debugging messages (for areas)
-L, --local Use local tests only (no DNS)
-P, --paranoid Die upon user errors
-H [dir], --helper-home-dir[=dir] Specify a different HOME directory
--ssl Run an SSL server
--server-key keyfile Specify an SSL keyfile
--server-cert certfile Specify an SSL certificate
--socketpath=path Listen on given UNIX domain socket
--socketowner=name Set UNIX domain socket file’s owner
--socketgroup=name Set UNIX domain socket file’s group
--socketmode=mode Set UNIX domain socket file’s mode
The purpose of this program is to provide a daemonized version of the
spamassassin executable. The goal is improving throughput performance
for automated mail checking.
This is intended to be used alongside "spamc", a fast, low-overhead C
See the README file in the "spamd" directory of the SpamAssassin
distribution for more details.
Note: Although "spamd" will check per-user config files for every
message, any changes to the system-wide config files will require
either restarting spamd or forcing it to reload itself via SIGHUP for
the changes to take effect.
Note: If "spamd" receives a SIGHUP, it internally reloads itself, which
means that it will change its pid and might not restart at all if its
environment changed (ie. if it can’t change back into its own
directory). If you plan to use SIGHUP, you should always start "spamd"
with the -r switch to know its current pid.
Options of the long form can be shortened as long as they remain
unambiguous. (i.e. --dae can be used instead of --daemonize) Also,
boolean options (like --user-config) can be negated by adding no
(--nouser-config), however, this is usually unnecessary.
Allow learning and forgetting (to a local Bayes database),
reporting and revoking (to a remote database) by spamd. The client
issues a TELL command to tell what type of message is being
processed and whether local (learn/forget) or remote
(report/revoke) databases should be updated.
Note that spamd always trusts the username passed in (unless
--auth-ident is used) so clients could maliciously learn messages
for other users. (This is not ususally a concern with an SQL Bayes
store as users will typically have read-write access directly to
the database, and can also use "sa-learn" with the -u option to
achieve the same result.)
Create user preferences files if they don’t exist (default: don’t).
-C path, --configpath=path
Use the specified path for locating the distributed configuration
files. Ignore the default directories (usually
"/usr/share/spamassassin" or similar).
Use the specified path for locating site-specific configuration
files. Ignore the default directories (usually "/etc/spamassassin"
Detach from starting process and run in background (daemonize).
Print a brief help message, then exit without further action.
-i [ipaddress], --listen-ip[=ipaddress], --ip-address[=ipaddress]
Tells spamd to listen on the specified IP address (defaults to
127.0.0.1). If you specify no IP address after the switch, spamd
will listen on all interfaces. (This is equal to the address
0.0.0.0). You can also use a valid hostname which will make spamd
listen on the first address that name resolves to.
-p port, --port=port
Optionally specifies the port number for the server to listen on
Turn on SQL lookups even when per-user config files have been
disabled with -x. this is useful for spamd hosts which don’t have
user’s home directories but do want to load user preferences from
an SQL database.
If your spamc client does not support sending the "User:" header,
like "exiscan", then the SQL username used will always be nobody.
Turn on LDAP lookups. This is completely analog to "--sql-config",
only it is using an LDAP server.
Turn on SQL lookups even when per-user config files have been
disabled with -x and also setuid to the user. This is useful for
spamd hosts which want to load user preferences from an SQL
database but also wish to support the use of -H (Helper home
Turn on LDAP lookups even when per-user config files have been
disabled with -x and also setuid to the user. This is again
completely analog to "--setuid-with-sql", only it is using an LDAP
This option specifies where per-user preferences can be found for
virtual users, for the -x switch. The pattern is used as a base
pattern for the directory name. Any of the following escapes can
%u -- replaced with the full name of the current user, as sent by
%l -- replaced with the ’local part’ of the current username. In
other words, if the username is an email address, this is the part
before the "@" sign.
%d -- replaced with the ’domain’ of the current username. In other
words, if the username is an email address, this is the part after
the "@" sign.
%% -- replaced with a single percent sign (%).
So for example, if "/vhome/users/%u/spamassassin" is specified, and
spamc sends a virtual username of "email@example.com", the directory
"/firstname.lastname@example.org/spamassassin" will be used.
The set of characters allowed in the virtual username for this path
are restricted to:
A-Z a-z 0-9 - + _ . , @ =
All others will be replaced by underscores ("_").
This path must be a writable directory. It will be created if it
does not already exist. If a file called user_prefs exists in this
directory (note: not in a ".spamassassin" subdirectory!), it will
be loaded as the user’s preferences. The Bayes databases for that
user will be stored in this directory.
Note that this requires that -x is used, and cannot be combined
with SQL- or LDAP-based configuration.
The pattern must expand to an absolute directory when spamd is
running daemonized (-d).
-r pidfile, --pidfile=pidfile
Write the process ID of the spamd parent to the file specified by
pidfile. The file will be unlinked when the parent exits. Note
that when running with the -u option, the file must be writable by
Enable vpopmail config. If specified with with -u set to the
vpopmail user, this allows spamd to lookup/create user_prefs in the
vpopmail user’s own maildir. This option is useful for vpopmail
virtual users who do not have an entry in the system /etc/passwd
Currently, use of this without -u is not supported.
-s facility, --syslog=facility
Specify the syslog facility to use (default: mail). If "stderr" is
specified, output will be written to stderr. (This is useful if
you’re running "spamd" under the "daemontools" package.) With a
facility of "file", all output goes to spamd.log. facility is
interpreted as a file name to log to if it contains any characters
except a-z and 0-9. "null" disables logging completely (used
Examples: spamd -s mail # use syslog, facility
mail (default) spamd -s ./mail # log to file
./mail spamd -s stderr 2>/dev/null # log to stderr, throw
messages away spamd -s null # the same as
above spamd -s file # log to file ./spamd.log
spamd -s /var/log/spamd.log # log to file /var/log/spamd.log
If logging to a file is enabled and that log file is rotated, the
spamd server must be restarted with a SIGHUP. (If the log file is
just truncated, this is not needed but still recommended.)
Note that logging to a file does not use locking, so you cannot
intermix logging from spamd and other processes into the same file.
If you want to mix logging like this, use syslog instead.
If you use syslog logging, it is essential to send a SIGHUP to the
spamd daemon when you restart the syslogd daemon. (This is due to
a shortcoming in Perl’s syslog handling, where the disappearance of
the connection to the syslogd is considered a fatal error.)
Specify how spamd should send messages to syslogd. The options are
"unix", "inet" or "none". The default is to try "unix" first,
falling back to "inet" if perl detects errors in its "unix"
Some platforms, or versions of perl, are shipped with dysfunctional
versions of the Sys::Syslog package which do not support some
socket types, so you may need to set this. If you get error
messages regarding __PATH_LOG or similar from spamd, try changing
The socket type "file" is used internally and should not be
specified. Use the "-s" switch instead.
-u username, --username=username
Run as the named user. If this option is not set, the default
behaviour is to setuid() to the user running "spamc", if "spamd" is
running as root.
Note: "--username=root" is not a valid option. If specified,
"spamd" will exit with a fatal error on startup.
-x, --nouser-config, --user-config
Turn off(on) reading of per-user configuration files (user_prefs)
from the user’s home directory. The default behaviour is to read
per-user configuration from the user’s home directory.
This option does not disable or otherwise influence the SQL, LDAP
or Virtual Config Dir settings.
Verify the username provided by spamc using ident. This is only
useful if connections are only allowed from trusted hosts (because
an identd that lies is trivial to create) and if spamc REALLY
SHOULD be running as the user it represents. Connections are
terminated immediately if authentication fails. In this case,
spamc will pass the mail through unchecked. Failure to connect to
an ident server, and response timeouts are considered
authentication failures. This requires that Net::Ident be
Wait at most timeout seconds for a response to ident queries.
Authentication that takes long that timeout seconds will fail, and
mail will not be processed. Setting this to 0.0 or less results in
no timeout, which is STRONGLY discouraged. The default is 5
-A host,..., --allowed-ips=host,...
Specify a list of authorized hosts or networks which can connect to
this spamd instance. Single IP addresses can be given, ranges of IP
addresses in address/masklength CIDR format, or ranges of IP
addresses by listing 3 or less octets with a trailing dot.
Hostnames are not supported, only IP addresses. This option can be
specified multiple times, or can take a list of addresses separated
by commas. Examples:
-A 10.11.12.13 -- only allow connections from 10.11.12.13.
-A 10.11.12.13,10.11.12.14 -- only allow connections from
10.11.12.13 and 10.11.12.14.
-A 10.200.300.0/24 -- allow connections from any machine in the
-A 10. -- allow connections from any machine in the range
By default, connections are only accepted from localhost
-D [area,...], --debug [area,...]
Produce debugging output. If no areas are listed, all debugging
information is printed. Diagnostic output can also be enabled for
each area individually; area is the area of the code to instrument.
For example, to produce diagnostic output on bayes, learn, and dns,
spamassassin -D bayes,learn,dns
Higher priority informational messages that are suitable for
logging in normal circumstances are available with an area of
Perform only local tests on all mail. In other words, skip DNS and
other network tests. Works the same as the "-L" flag to
Die on user errors (for the user passed from spamc) instead of
falling back to user nobody and using the default configuration.
-m number , --max-children=number
This option specifies the maximum number of children to spawn.
Spamd will spawn that number of children, then sleep in the
background until a child dies, wherein it will go and spawn a new
Incoming connections can still occur if all of the children are
busy, however those connections will be queued waiting for a free
child. The minimum value is 1, the default value is 5.
Please note that there is a OS specific maximum of connections that
can be queued (Try "perl -MSocket -e’print SOMAXCONN’" to find this
Note that if you run too many servers for the amount of free RAM
available, you run the danger of hurting performance by causing a
high swap load as server processes are swapped in and out
The minimum number of children that will be kept running. The
minimum value is 1, the default value is 1. If you have lots of
free RAM, you may want to increase this.
The lower limit for the number of spare children allowed to run. A
spare, or idle, child is one that is not handling a scan request.
If there are too few spare children available, a new server will be
started every second or so. The default value is 1.
The upper limit for the number of spare children allowed to run.
If there are too many spare children, one will be killed every
second or so until the number of idle children is in the desired
range. The default value is 2.
This option specifies the maximum number of connections each child
should process before dying and letting the master spamd process
spawn a new child. The minimum value is 1, the default value is
By default, "spamd" will attempt to keep a small number of "hot"
child processes as busy as possible, and keep any others as idle as
possible, using something similar to the Apache httpd server
scaling algorithm. This is accomplished by the master process
coordinating the activities of the children. This switch will
disable this scaling algorithm, and the behaviour seen in the 3.0.x
versions will be used instead, where all processes receive an equal
load and no scaling takes place.
This option specifies the number of seconds to wait for headers
from a client (spamc) before closing the connection. The minimum
value is 1, the default value is 30, and a value of 0 will disable
socket timeouts completely.
This option specifies the number of seconds to wait for a spamd
child to to process or check a message. The minimum value is 1,
the default value is 300, and a value of 0 will disable child
-H directory, --helper-home-dir=directory
Specify that external programs such as Razor, DCC, and Pyzor should
have a HOME environment variable set to a specific directory. The
default is to use the HOME environment variable setting from the
shell running spamd. By specifying no argument, spamd will use the
spamc caller’s home directory instead.
Accept only SSL connections. The IO::Socket::SSL perl module must
Specify the SSL key file to use for SSL connections.
Specify the SSL certificate file to use for SSL connections.
Listen on UNIX domain path pathname instead of a TCP socket.
Warning: the Perl support on BSD platforms for UNIX domain sockets
seems to have a bug regarding paths of over 100 bytes or so
(SpamAssassin bug 4380). If you see a ’could not find newly-
created UNIX socket’ error message, and the path appears truncated,
this may be the cause. Try using a shorter path to the socket.
Set UNIX domain socket to be owned by the user named name. Note
that this requires that spamd be started as "root", and if "-u" is
used, that user should have write permissions to unlink the file
later, for when the "spamd" server is killed.
Set UNIX domain socket to be owned by the group named name. See
"--socketowner" for notes on ownership and permissions.
Set UNIX domain socket to use the octal mode mode. Note that if
"-u" is used, that user should have write permissions to unlink the
file later, for when the "spamd" server is killed.
spamc(1) spamassassin(1) Mail::SpamAssassin::Conf(3)
The SpamAssassin(tm) Project (http://spamassassin.apache.org/)
SpamAssassin is distributed under the Apache License, Version 2.0, as
described in the file "LICENSE" included with the distribution.