Provided by: spamc_3.4.2-0ubuntu0.18.04.5_amd64 
NAME
spamc - client for spamd
SYNOPSIS
spamc [options] < message
DESCRIPTION
Spamc is the client half of the spamc/spamd pair. It should be used in place of "spamassassin" in
scripts to process mail. It will read the mail from STDIN, and spool it to its connection to spamd, then
read the result back and print it to STDOUT. Spamc has extremely low overhead in loading, so it should
be much faster to load than the whole spamassassin program.
See the README file in the spamd directory of the SpamAssassin distribution for more details.
OPTIONS
All options detailed below can be passed as command line arguments, or be contained in a configuration
file, as described in the CONFIGURATION FILE section below.
Note that the long options, a la "--long-options", are new as of SpamAssassin 3.2.0, and were not
available in earlier versions.
-B, --bsmtp
Assume input is a single BSMTP-formatted message. In other words, spamc will pull out everything
between the DATA line and the lone-dot line to feed to spamd, and will place the spamd output back in
the same envelope (thus, any SIZE extension in your BSMTP file will cause many problems).
-c, --check
Just check if the message is spam or not. Set process exitcode to 1 if message is spam, 0 if not
spam or processing failure occurs. Will print score/threshold to stdout (as ints) or 0/0 if there
was an error. Combining -c and -E is a no-op, since -c implies the behaviour of -E.
-d host[,host2], --dest=host[,host2]
In TCP/IP mode, connect to spamd server on given host (default: localhost). Several hosts can be
specified if separated by commas.
If host resolves to multiple addresses, then spamc will fail-over to the other addresses, if the
first one cannot be connected to. It will first try all addresses of one host before it tries the
next one in the list. Note that this fail-over behaviour is incompatible with -x; if that switch is
used, fail-over will not occur.
-4 Use IPv4 only for connecting to server. Restricts domain name resolution of spamd server host(s) to
address family AF_INET through the "hints.ai_family" flag in the call to getaddrinfo(3).
-6 Use IPv6 only for connecting to server. Restricts domain name resolution of spamd server host(s) to
address family AF_INET6 through the "hints.ai_family" flag in the call to getaddrinfo(3).
-e command [args], --pipe-to command [args]
Instead of writing to stdout, pipe the output to command's standard input. Note that there is a very
slight chance mail will be lost here, because if the fork-and-exec fails there's no place to put the
mail message.
Note that this must be the LAST command line option, as everything after the -e is taken as arguments
to the command (it's like rxvt or xterm).
This option is not supported on Win32 platforms.
-E, --exitcode
Filter according to the other options, but set the process exitcode to 1 if message is spam, 0 if not
spam or processing failure occurs.
-F /path/to/file, --config=path
Specify a configuration file to read additional command-line flags from. See CONFIGURATION FILE
below.
-h, --help
Print this help message and terminate without action.
-H, --randomize
For TCP/IP sockets, randomize the IP addresses returned for the hosts given by the -d switch. This
provides for a simple kind of load balancing. It will try only three times though.
-l, --log-to-stderr
Send log messages to stderr, instead of to the syslog.
-L learn type, --learntype=type
Send message to spamd for learning. The "learn type" can be either spam, ham or forget. The
exitcode for spamc will be set to 5 if the message was learned, or 6 if it was already learned, under
a condition that a --no-safe-fallback option is selected too.
Note that the "spamd" must run with the "--allow-tell" option for this to work.
-C report type, --reporttype=type
Report or revoke a message to one of the configured collaborative filtering databases. The "report
type" can be either report or revoke.
Note that the "spamd" must run with the "--allow-tell" option for this to work.
-p port, --port=port
In TCP/IP mode, connect to spamd server listening on given port (default: 783).
-r, --full-spam
Just output the SpamAssassin report text to stdout, if the message is spam. If the message is ham
(non-spam), nothing will be printed. The first line of the output is the message score and the
threshold, in this format:
score/threshold
-R, --full
Just output the SpamAssassin report text to stdout, for all messages. See -r for details of the
output format used.
-s max_size, --max-size=max_size
Set the maximum message size which will be sent to spamd -- any bigger than this threshold and the
message will be returned unprocessed (default: 500 KB). If spamc gets handed a message bigger than
this, it won't be passed to spamd. The maximum message size is 256 MB.
The size is specified in bytes, as a positive integer greater than 0. For example, -s 500000.
--connect-retries=retries
Retry connecting to spamd retries times. The default is 3 times.
--retry-sleep=sleep
Sleep for sleep seconds between attempts to connect to spamd. The default is 1 second.
--filter-retries=retries
Retry filtering retries times if the spamd process fails (usually times out). This differs from
--connect-retries in that it times out the transaction after the TCP connection has been established
successfully. The default is 1 time (ie. one attempt and no retries).
--filter-retry-sleep=sleep
Sleep for sleep seconds between failed spamd filtering attempts. The default is 1 second.
-S, --ssl, --ssl
If spamc was built with support for SSL, encrypt data to and from the spamd process with SSL; spamd
must support SSL as well.
-t timeout, --timeout=timeout
Set the timeout for spamc-to-spamd communications (default: 600, 0 disables). If spamd takes longer
than this many seconds to reply to a message, spamc will abort the connection and treat this as a
failure to connect; in other words the message will be returned unprocessed.
-n timeout, --connect-timeout=timeout
Set the timeout for spamc-to-spamd connection establishment (default: 600, 0 disables). If spamc
takes longer than this many seconds to establish a connection to spamd, spamc will abort the
connection and treat this as a failure to connect; in other words the message will be returned
unprocessed.
-u username, --username=username
To have spamd use per-user-config files, run spamc as the user whose config files spamd should load;
by default the effective user-ID is sent to spamd. If you're running spamc as some other user,
though, (eg. root, mail, nobody, cyrus, etc.) then you may use this flag to override the default.
-U socketpath, --socket=path
Connect to "spamd" via UNIX domain socket socketpath instead of a TCP/IP connection.
This option is not supported on Win32 platforms.
-V, --version
Report the version of this "spamc" client. If built with SSL support, an additional line will be
included noting this, like so:
SpamAssassin Client version 3.0.0-rc4
compiled with SSL support (OpenSSL 0.9.7d 17 Mar 2004)
-x, --no-safe-fallback
Disables the 'safe fallback' error-recovery method, which passes through the unaltered message if an
error occurs. Instead, exit with an error code, and let the MTA queue up the mails for a retry
later. See also "EXIT CODES".
This also disables the TCP fail-over behaviour from -d.
-X, --unavailable-tempfail
When disabling 'safe fallback' with -x, this option will turn EX_UNAVAILABLE errors into EX_TEMPFAIL.
This may allow your MTA to defer mails with a temporary SMTP error instead of bouncing them with a
permanent SMTP error. See also "EXIT CODES".
-y, --tests
Just output the names of the tests hit to stdout, on one line, separated by commas.
-K Perform a keep-alive check of spamd, instead of a full message check.
-z Use gzip compression to compress the mail message sent to "spamd". This is useful for long-distance
use of spamc over the internet. Note that this relies on "zlib" being installed on the "spamc" client
side, and the "Compress::Zlib" perl module on the server side; an error will be returned otherwise.
--headers
Perform a scan, but instead of allowing any part of the message (header and body) to be rewritten,
limit rewriting to only the message headers. This is much more efficient in bandwidth usage, since
the response message transmitted back from the spamd server will not include the body.
Note that this only makes sense if you are using "report_safe 0" in the scanning configuration on the
remote end; with "report_safe 1", it is likely to result in corrupt messages.
CONFIGURATION FILE
The above command-line switches can also be loaded from a configuration file.
The format of the file is similar to the SpamAssassin rules files; blank lines and lines beginning with
"#" are ignored. Any space-separated words are considered additions to the command line, and are
prepended. Newlines are treated as equivalent to spaces. Existing command line switches will override any
settings in the configuration file.
If the -F switch is specified, that file will be used. Otherwise, "spamc" will attempt to load
spamc.conf in "SYSCONFDIR" (default: /etc/spamassassin). If that file doesn't exist, and the -F switch is
not specified, no configuration file will be read.
Example:
# spamc global configuration file
# connect to "server.example.com", port 783
-d server.example.com
-p 783
# max message size for scanning = 350k
-s 350000
EXIT CODES
By default, spamc will use the 'safe fallback' error recovery method. That means, it will always exit
with an exit code of 0, even if an error was encountered. If any error occurrs, it will simply pass
through the unaltered message.
The -c and -E options modify this; instead, spamc will use an exit code of 1 if the message is determined
to be spam.
If one of the "-x", "-L" or "-C" options are specified, 'safe fallback' will be disabled, and certain
error conditions related to communication between spamc and spamd will result in an error code.
The exit codes used are as follows:
EX_USAGE 64 command line usage error
EX_DATAERR 65 data format error
EX_NOINPUT 66 cannot open input
EX_NOUSER 67 addressee unknown
EX_NOHOST 68 host name unknown
EX_UNAVAILABLE 69 service unavailable
EX_SOFTWARE 70 internal software error
EX_OSERR 71 system error (e.g., can't fork)
EX_OSFILE 72 critical OS file missing
EX_CANTCREAT 73 can't create (user) output file
EX_IOERR 74 input/output error
EX_TEMPFAIL 75 temp failure; user is invited to retry
EX_PROTOCOL 76 remote error in protocol
EX_NOPERM 77 permission denied
EX_CONFIG 78 configuration error
* The EX_TOOBIG error level is never used. If spamc receives a message
that is too big, the exit code will be 0.
EX_TOOBIG 98 message was too big to process (see --max-size)
SEE ALSO
spamd(8) spamassassin(1) Mail::SpamAssassin(3)
PREREQUISITES
"Mail::SpamAssassin"
AUTHORS
The SpamAssassin(tm) Project <http://spamassassin.apache.org/>
COPYRIGHT
SpamAssassin is distributed under the Apache License, Version 2.0, as described in the file "LICENSE"
included with the distribution.