Section: User Contributed Perl Documentation (1)
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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 (needs -x)
-Q, --setuid-with-sql Enable SQL config (needs -x,
enables use of -H)
--ldap-config Enable LDAP config (needs -x)
--setuid-with-ldap Enable LDAP config (needs -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
-g groupname, --groupname=groupname Run as groupname
-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 client
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.
- -l, --allow-tell
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
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.)
- -c, --create-prefs
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/mail/spamassassin" or similar).
- -d, --daemonize
Detach from starting process and run in background (daemonize).
- -h, --help
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 (default: 783).
- -q, --sql-config
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
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.
- -Q, --setuid-with-sql
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 directories.)
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 server.
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 be used:
- %u --- replaced with the full name of the current user, as sent by spamc.
- %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 "firstname.lastname@example.org", the directory
"/email@example.com/spamassassin" will be used.
The set of characters allowed in the virtual username for this path are
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
Currently, use of this without -u is not supported. This inhibits setuid.
- -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 that user.
- -v, --vpopmail
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 file.
Currently, use of this without -u is not supported. This inhibits setuid.
- -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
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" support.
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 this setting.
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
Note: ``--username=root'' is not a valid option. If specified, "spamd" will
exit with a fatal error on startup.
- -g groupname, --groupname=groupname
Run as the named group if --username is being used. If this option is
not set when --username is used then the primary group for the user
given to --username is used.
- -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 installed.
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 seconds.
- -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
-A 10.200.300.0/24 --- allow connections from any machine in the range
-A 10. --- allow connections from any machine in the range "10.*.*.*".
By default, connections are only accepted from localhost [127.0.0.1].
- -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, use:
spamassassin -D bayes,learn,dns
Higher priority informational messages that are suitable for logging in normal
circumstances are available with an area of ``info''.
For more information about which areas (also known as channels) are available,
please see the documentation at:
- -L, --local
Perform only local tests on all mail. In other words, skip DNS and other
network tests. Works the same as the "-L" flag to spamassassin(1).
- -P, --paranoid
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 child.
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 maximum).
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 continually.
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
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
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 200.
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
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 timeouts completely.
- -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 be
- --server-key keyfile
Specify the SSL key file to use for SSL connections.
- --server-cert certfile
Specify the SSL certificate file to use for SSL connections.
- --socketpath pathname
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.
- --socketowner name
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.
- --socketgroup name
Set UNIX domain socket to be owned by the group named name. See
"--socketowner" for notes on ownership and permissions.
- --socketmode mode
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.
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.
- SEE ALSO
linux.jgfs.net manual pages