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NAME
procmailrc - procmail rcfile
SYNOPSIS
$HOME/.procmailrc
DESCRIPTION
For a quick start, see NOTES at the end of the procmail(1)
man page.
The rcfile can contain a mixture of environment variable
assignments (some of which have special meanings to proc-
mail), and recipes. In their most simple appearance, the
recipes are simply one line regular expressions that are
searched for in the header of the arriving mail. The first
recipe that matches is used to determine where the mail has
to go (usually a file). If processing falls off the end of
the rcfile, procmail will deliver the mail to $DEFAULT.
There are two kinds of recipes: delivering and non-
delivering recipes. If a delivering recipe is found to
match, procmail considers the mail (you guessed it)
delivered and will cease processing the rcfile after having
successfully executed the action line of the recipe. If a
non-delivering recipe is found to match, processing of the
rcfile will continue after the action line of this recipe
has been executed.
Delivering recipes are those that cause header and/or body
of the mail to be: written into a file, absorbed by a pro-
gram or forwarded to a mailaddress.
Non-delivering recipes are: those that cause the output of a
program or filter to be captured back by procmail or those
that start a nesting block.
You can tell procmail to treat a delivering recipe as if it
were a non-delivering recipe by specifying the `c' flag on
such a recipe. This will make procmail generate a carbon
copy of the mail by delivering it to this recipe, yet con-
tinue processing the rcfile.
By using any number of recipes you can presort your mail
extremely straightforward into several mailfolders. Bear in
mind though that the mail can arrive concurrently in these
mailfolders (if several procmail programs happen to run at
the same time, not unlikely if a lot of mail arrives). To
make sure this does not result in a mess, proper use of
lockfiles is highly recommended.
The environment variable assignments and recipes can be
freely intermixed in the rcfile. If any environment variable
has a special meaning to procmail, it will be used appropri-
ately the moment it is parsed (i.e. you can change the
current directory whenever you want by specifying a new
MAILDIR, switch lockfiles by specifying a new LOCKFILE,
change the umask at any time, etc., the possibilities are
endless :-).
The assignments and substitutions of these environment vari-
ables are handled exactly like in sh(1) (that includes all
possible quotes and escapes), with the added bonus that
blanks around the '=' sign are ignored and that, if an
environment variable appears without a trailing '=', it will
be removed from the environment. Any program in backquotes
started by procmail will have the entire mail at its stdin.
Comments
A word beginning with # and all the following characters up
to a NEWLINE are ignored. This does not apply to condition
lines, which cannot be commented.
Recipes
A line starting with ':' marks the beginning of a recipe.
It has the following format:
:0 [flags] [ : [locallockfile] ]
<zero or more conditions (one per line)>
<exactly one action line>
Conditions start with a leading `*', everything after that
character is passed on to the internal egrep literally,
except for leading and trailing whitespace. These regular
expressions are completely compatible to the normal egrep(1)
extended regular expressions. See also Extended regular
expressions.
Conditions are anded; if there are no conditions the result
will be true by default.
Flags can be any of the following:
H Egrep the header (default).
B Egrep the body.
D Tell the internal egrep to distinguish between upper
and lower case (contrary to the default which is to
ignore case).
A This recipe will not be executed unless the conditions
on the last preceding recipe (on the current block-
nesting level) without the `A' or `a' flag matched as
well. This allows you to chain actions that depend on
a common condition.
a Has the same meaning as the `A' flag, with the addi-
tional condition that the immediately preceding recipe
must have been successfully completed before this
recipe is executed.
E This recipe only executes if the immediately preceding
recipe was not executed. Execution of this recipe also
disables any immediately following recipes with the 'E'
flag. This allows you to specify `else if' actions.
e This recipe only executes if the immediately preceding
recipe failed (i.e. the action line was attempted, but
resulted in an error).
h Feed the header to the pipe, file or mail destination
(default).
b Feed the body to the pipe, file or mail destination
(default).
f Consider the pipe as a filter.
c Generate a carbon copy of this mail. This only makes
sense on delivering recipes. The only non-delivering
recipe this flag has an effect on is on a nesting
block, in order to generate a carbon copy this will
clone the running procmail process (lockfiles will not
be inherited), whereby the clone will proceed as usual
and the parent will jump across the block.
w Wait for the filter or program to finish and check its
exitcode (normally ignored); if the filter is unsuc-
cessful, then the text will not have been filtered.
W Has the same meaning as the `w' flag, but will suppress
any `Program failure' message.
i Ignore any write errors on this recipe (i.e. usually
due to an early closed pipe).
r Raw mode, do not try to ensure the mail ends with an
empty line, write it out as is.
There are some special conditions you can use that are not
straight regular expressions. To select them, the condition
must start with:
! Invert the condition.
$ Evaluate the remainder of this condition according to
sh(1) substitution rules inside double quotes, skip
leading whitespace, then reparse it.
? Use the exitcode of the specified program.
< Check if the total length of the mail is shorter than
the specified (in decimal) number of bytes.
> Analogous to '<'.
variablename ??
Match the remainder of this condition against the value
of this environment variable (which cannot be a pseudo
variable). A special case is if variablename is equal
to `B', `H', `HB' or `BH'; this merely overrides the
default header/body search area defined by the initial
flags on this recipe.
\ To quote any of the above at the start of the line.
Local lockfile
If you put a second (trailing) ':' on the first recipe line,
then procmail will use a locallockfile (for this recipe
only). You can optionally specify the locallockfile to use;
if you don't however, procmail will use the destination
filename (or the filename following the first '>>') and will
append $LOCKEXT to it.
Recipe action line
The action line can start with the following characters:
! Forwards to all the specified mail addresses.
| Starts the specified program, possibly in $SHELL if any
of the characters $SHELLMETAS are spotted. You can
optionally prepend this pipe symbol with variable=,
which will cause stdout of the program to be captured
in the environment variable (procmail will not ter-
minate processing the rcfile at this point). If you
specify just this pipe symbol, without any program,
then procmail will pipe the mail to stdout.
{ Followed by at least one space, tab or newline will
mark the start of a nesting block. Everything up till
the next closing brace will depend on the conditions
specified for this recipe. Unlimited nesting is per-
mitted. The closing brace exists merely to delimit the
block, it will not cause procmail to terminate in any
way. If the end of a block is reached processing will
continue as usual after the block. On a nesting block,
the flags `H' and `B' only affect the conditions lead-
ing up to the block, the flags `h' and `b' have no
effect whatsoever.
Anything else will be taken as a mailbox name (either a
filename or a directory, absolute or relative to the current
directory (see MAILDIR)). If it is a (possibly yet nonex-
istent) filename, the mail will be appended to it.
If it is a directory, the mail will be delivered to a newly
created, guaranteed to be unique file named $MSGPREFIX* in
the specified directory. If the mailbox name ends in "/.",
then this directory is presumed to be an MH folder; i.e.,
procmail will use the next number it finds available. If
the mailbox name ends in "/", then this directory is
presumed to be a maildir folder; i.e., procmail will deliver
the message to a file in a subdirectory named "tmp" and
rename it to be inside a subdirectory named "new". If the
mailbox is specified to be an MH folder or maildir folder,
procmail will create the necessary directories if they don't
exist, rather than treat the mailbox as a non-existent
filename. When procmail is delivering to directories, you
can specify multiple directories to deliver to (procmail
will do so utilising hardlinks).
Environment variable defaults
LOGNAME, HOME and SHELL
Your (the recipient's) defaults
PATH $HOME/bin:/bin:/usr/ucb :/usr/local/bin
:/usr/bin/X11:/usr/X/bin
(Except during the processing of an
/etc/procmailrc file, when it will be
set to `/bin :/usr/ucb :/usr/local/bin
:/usr/bin/X11:/usr/X/bin'.)
SHELLMETAS &|<>~;?*[
SHELLFLAGS -c
ORGMAIL /var/mail/$LOGNAME
(Unless -m has been specified, in
which case it is unset)
MAILDIR $HOME/
(Unless the name of the first success-
fully opened rcfile starts with `./'
or if -m has been specified, in which
case it defaults to `.')
DEFAULT $ORGMAIL
MSGPREFIX msg.
SENDMAIL /usr/lib/sendmail
SENDMAILFLAGS -oi
HOST The current hostname
COMSAT no
(If an rcfile is specified on the com-
mand line)
PROCMAIL_VERSION 3.15.1
LOCKEXT .lock
Other cleared or preset environment variables are IFS, ENV
and PWD.
Environment
Before you get lost in the multitude of environment vari-
ables, keep in mind that all of them have reasonable
defaults.
MAILDIR Current directory while procmail is executing
(that means that all paths are relative to
$MAILDIR).
DEFAULT Default mailbox file (if not told otherwise,
procmail will dump mail in this mailbox). Proc-
mail will automatically use $DEFAULT$LOCKEXT as
lockfile prior to writing to this mailbox. You
do not need to set this variable, since it
already points to the standard system mailbox.
LOGFILE This file will also contain any error or diag-
nostic messages from procmail (normally none :-)
or any other programs started by procmail. If
this file is not specified, any diagnostics or
error messages will be mailed back to the
sender. See also LOGABSTRACT.
VERBOSE You can turn on extended diagnostics by setting
this variable to `yes' or `on', to turn it off
again set it to `no' or `off'.
LOGABSTRACT Just before procmail exits it logs an abstract
of the delivered message in $LOGFILE showing the
`From ' and `Subject:' fields of the header,
what folder it finally went to and how long (in
bytes) the message was. By setting this vari-
able to `no', generation of this abstract is
suppressed. If you set it to `all', procmail
will log an abstract for every successful
delivering recipe it processes.
LOG Anything assigned to this variable will be
appended to $LOGFILE.
ORGMAIL Usually the system mailbox (ORiGinal MAILbox).
If, for some obscure reason (like `filesystem
full') the mail could not be delivered, then
this mailbox will be the last resort. If proc-
mail fails to save the mail in here (deep, deep
trouble :-), then the mail will bounce back to
the sender.
LOCKFILE Global semaphore file. If this file already
exists, procmail will wait until it has gone
before proceeding, and will create it itself
(cleaning it up when ready, of course). If more
than one lockfile are specified, then the previ-
ous one will be removed before trying to create
the new one. The use of a global lockfile is
discouraged, whenever possible use locallock-
files (on a per recipe basis) instead.
LOCKEXT Default extension that is appended to a destina-
tion file to determine what local lockfile to
use (only if turned on, on a per-recipe basis).
LOCKSLEEP Number of seconds procmail will sleep before
retrying on a lockfile (if it already existed);
if not specified, it defaults to 8 seconds.
LOCKTIMEOUT Number of seconds that have to have passed since
a lockfile was last modified/created before
procmail decides that this must be an errone-
ously leftover lockfile that can be removed by
force now. If zero, then no timeout will be
used and procmail will wait forever until the
lockfile is removed; if not specified, it
defaults to 1024 seconds. This variable is use-
ful to prevent indefinite hangups of
sendmail/procmail. Procmail is immune to clock
skew across machines.
TIMEOUT Number of seconds that have to have passed
before procmail decides that some child it
started must be hanging. The offending program
will receive a TERMINATE signal from procmail,
and processing of the rcfile will continue. If
zero, then no timeout will be used and procmail
will wait forever until the child has ter-
minated; if not specified, it defaults to 960
seconds.
MSGPREFIX Filename prefix that is used when delivering to
a directory (not used when delivering to a mail-
dir or an MH directory).
HOST If this is not the hostname of the machine, pro-
cessing of the current rcfile will immediately
cease. If other rcfiles were specified on the
command line, processing will continue with the
next one. If all rcfiles are exhausted, the
program will terminate, but will not generate an
error (i.e. to the mailer it will seem that the
mail has been delivered).
UMASK The name says it all (if it doesn't, then forget
about this one :-). Anything assigned to UMASK
is taken as an octal number. If not specified,
the umask defaults to 077. If the umask permits
o+x, all the mailboxes procmail delivers to
directly will receive an o+x mode change. This
can be used to check if new mail arrived.
SHELLMETAS If any of the characters in SHELLMETAS appears
in the line specifying a filter or program, the
line will be fed to $SHELL instead of being exe-
cuted directly.
SHELLFLAGS Any invocation of $SHELL will be like:
"$SHELL" "$SHELLFLAGS" "$*";
SENDMAIL If you're not using the forwarding facility
don't worry about this one. It specifies the
program being called to forward any mail.
It gets invoked as: "$SENDMAIL" $SENDMAILFLAGS
"$@";
NORESRETRY Number of retries that are to be made if any
`process table full', `file table full', `out of
memory' or `out of swap space' error should
occur. If this number is negative, then proc-
mail will retry indefinitely; if not specified,
it defaults to 4 times. The retries occur with
a $SUSPEND second interval. The idea behind
this is, that if e.g. the swap space has been
exhausted or the process table is full, usually
several other programs will either detect this
as well and abort or crash 8-), thereby freeing
valuable resources for procmail.
SUSPEND Number of seconds that procmail will pause if it
has to wait for something that is currently una-
vailable (memory, fork, etc.); if not specified,
it will default to 16 seconds. See also:
LOCKSLEEP.
LINEBUF Length of the internal line buffers, cannot be
set smaller than 128. All lines read from the
rcfile should not exceed $LINEBUF characters
before and after expansion. If not specified,
it defaults to 2048. This limit, of course,
does not apply to the mail itself, which can
have arbitrary line lengths, or could be a
binary file for that matter. See also
PROCMAIL_OVERFLOW.
DELIVERED If set to `yes' procmail will pretend (to the
mail agent) the mail has been delivered. If
mail cannot be delivered after having met this
assignment (set to `yes'), the mail will be lost
(i.e. it will not bounce).
TRAP When procmail terminates it will execute the
contents of this variable. A copy of the mail
can be read from stdin. Any output produced by
this command will be appended to $LOGFILE. Pos-
sible uses for TRAP are: removal of temporary
files, logging customised abstracts, etc. See
also EXITCODE and LOGABSTRACT.
EXITCODE When procmail terminates and this variable has
been set to a positive numeric value, procmail
will use this as the exitcode. If this variable
is set but empty, procmail will set the exitcode
to whatever the TRAP program returns. If this
variable has not been set, procmail will set it
shortly before calling up the TRAP program.
LASTFOLDER This variable is assigned to by procmail when-
ever it is delivering to a folder or program.
It always contains the name of the last file (or
program) procmail delivered to. If the last
delivery was to several directory folders
together then $LASTFOLDER will contain the
hardlinked filenames as a space separated list.
MATCH This variable is assigned to by procmail when-
ever it is told to extract text from a matching
regular expression. It will contain all text
matching the regular expression past the `\/'
token.
SHIFT Assigning a positive value to this variable has
the same effect as the `shift' command in sh(1).
This command is most useful to extract extra
arguments passed to procmail when acting as a
generic mailfilter.
INCLUDERC Names an rcfile (relative to the current direc-
tory) which will be included here as if it were
part of the current rcfile. Nesting is permit-
ted and only limited by systems resources
(memory and file descriptors). As no checking
is done on the permissions or ownership of the
rcfile, users of INCLUDERC should make sure that
only trusted users have write access to the
included rcfile or the directory it is in.
SWITCHRC Names an rcfile (relative to the current direc-
tory) to which processing will be switched. If
the named rcfile doesn't exist or is not a nor-
mal file or /dev/null then an error will be
logged and processing will continue in the
current rcfile. Otherwise, processing of the
current rcfile will be aborted and the named
rcfile started. Unsetting SWITCHRC aborts pro-
cessing of the current rcfile as if it had ended
at the assignment. As with INCLUDERC, no check-
ing is done on the permissions or ownership of
the rcfile.
PROCMAIL_VERSION
The version number of the running procmail
binary.
PROCMAIL_OVERFLOW
This variable will be set to a non-empty value
if procmail detects a buffer overflow. See the
BUGS section below for other details of opera-
tion when overflow occurs.
COMSAT Comsat(8)/biff(1) notification is on by default,
it can be turned off by setting this variable to
`no'. Alternatively the biff-service can be
customised by setting it to either `service@',
`@hostname', or `service@hostname'. When not
specified it defaults to biff@localhost.
DROPPRIVS If set to `yes' procmail will drop all
privileges it might have had (suid or sgid).
This is only useful if you want to guarantee
that the bottom half of the /etc/procmailrc file
is executed on behalf of the recipient.
Extended regular expressions
The following tokens are known to both the procmail internal
egrep and the standard egrep(1) (beware that some egrep
implementations include other non-standard extensions):
^ Start of a line.
$ End of a line.
. Any character except a newline.
a* Any sequence of zero or more a's.
a+ Any sequence of one or more a's.
a? Either zero or one a.
[^-a-d] Any character which is not either a dash, a, b, c,
d or newline.
de|abc Either the sequence `de' or `abc'.
(abc)* Zero or more times the sequence `abc'.
\. Matches a single dot; use \ to quote any of the
magic characters to get rid of their special mean-
ing. See also $\ variable substitution.
These were only samples, of course, any more complex combi-
nation is valid as well.
The following token meanings are special procmail exten-
sions:
^ or $ Match a newline (for multiline matches).
^^ Anchor the expression at the very start of the
search area, or if encountered at the end of the
expression, anchor it at the very end of the
search area.
\< or \> Match the character before or after a word. They
are merely a shorthand for `[^a-zA-Z0-9_]', but
can also match newlines. Since they match actual
characters, they are only suitable to delimit
words, not to delimit inter-word space.
\/ Splits the expression in two parts. Everything
matching the right part will be assigned to the
MATCH environment variable.
EXAMPLES
Look in the procmailex(5) man page.
CAVEATS
Continued lines in an action line that specifies a program
always have to end in a backslash, even if the underlying
shell would not need or want the backslash to indicate con-
tinuation. This is due to the two pass parsing process
needed (first procmail, then the shell (or not, depending on
SHELLMETAS)).
Don't put comments on the regular expression condition lines
in a recipe, these lines are fed to the internal egrep
literally (except for continuation backslashes at the end of
a line).
Leading whitespace on continued regular expression condition
lines is usually ignored (so that they can be indented), but
not on continued condition lines that are evaluated accord-
ing to the sh(1) substitution rules inside double quotes.
Watch out for deadlocks when doing unhealthy things like
forwarding mail to your own account. Deadlocks can be bro-
ken by proper use of LOCKTIMEOUT.
Any default values that procmail has for some environment
variables will always override the ones that were already
defined. If you really want to override the defaults, you
either have to put them in the rcfile or on the command line
as arguments.
The /etc/procmailrc file cannot change the PATH setting seen
by user rcfiles as the value is reset when procmail finishes
the /etc/procmailrc file. While future enhancements are
expected in this area, recompiling procmail with the desired
value is currently the only correct solution.
Environment variables set inside the shell-interpreted-`|'
action part of a recipe will not retain their value after
the recipe has finished since they are set in a subshell of
procmail. To make sure the value of an environment variable
is retained you have to put the assignment to the variable
before the leading `|' of a recipe, so that it can capture
stdout of the program.
If you specify only a `h' or a `b' flag on a delivering
recipe, and the recipe matches, then, unless the `c' flag is
present as well, the body respectively the header of the
mail will be silently lost.
SEE ALSO
procmail(1), procmailsc(5), procmailex(5), sh(1), csh(1),
mail(1), mailx(1), binmail(1), uucp(1), aliases(5),
sendmail(8), egrep(1), regexp(5), grep(1), biff(1),
comsat(8), lockfile(1), formail(1)
BUGS
The only substitutions of environment variables that can be
handled by procmail itself are of the type $name, ${name},
${name:-text}, ${name:+text}, ${name-text}, ${name+text},
$\name, $#, $n, $$, $?, $_, $- and $=; whereby $\name will
be substituted by the all-magic-regular-expression-
characters-disarmed equivalent of $name, $_ by the name of
the current rcfile, $- by $LASTFOLDER and $= will contain
the score of the last recipe. Furthermore, the result of
$\name substituion will never be split on whitespace. When
the -a or -m options are used, "$@" will expand to respec-
tively the specified argument (list); but only when passed
as in the argument list to a program, and then only one such
occurence will be expanded.
Unquoted variable expansions performed by procmail are al-
ways split on space, tab, and newline characters; the IFS
variable is not used internally.
Procmail does not support the expansion of `~'.
A line buffer of length $LINEBUF is used when processing the
rcfile, any expansions that don't fit within this limit will
be truncated and PROCMAIL_OVERFLOW will be set. If the
overflowing line is a condition or an action line, then it
will be considered failed and procmail will continue pro-
cessing. If it is a variable assignment or recipe start
line then procmail will abort the entire rcfile.
If the global lockfile has a relative path, and the current
directory is not the same as when the global lockfile was
created, then the global lockfile will not be removed if
procmail exits at that point (remedy: use absolute paths to
specify global lockfiles).
If an rcfile has a relative path and when the rcfile is
first opened MAILDIR contains a relative path, and if at one
point procmail is instructed to clone itself and the current
directory has changed since the rcfile was opened, then
procmail will not be able to clone itself (remedy: use an
absolute path to reference the rcfile or make sure MAILDIR
contains an absolute path as the rcfile is opened).
A locallockfile on the recipe that marks the start of a
non-forking nested block does not work as expected.
When capturing stdout from a recipe into an environment
variable, exactly one trailing newline will be stripped.
Some non-optimal and non-obvious regexps set MATCH to an in-
correct value. The regexp can be made to work by removing
one or more unneeded
MISCELLANEOUS
If the regular expression contains `^TO_' it will be substi-
tuted by `(^((Original-)?(Resent-)?(To|Cc|Bcc)|(X-Envelope
|Apparently(-Resent)?)-To):(.*[^-a-zA-Z0-9_.])?)', which
should catch all destination specifications containing a
specific address.
If the regular expression contains `^TO' it will be substi-
tuted by `(^((Original-)?(Resent-)?(To|Cc|Bcc)|(X-Envelope
|Apparently(-Resent)?)-To):(.*[^a-zA-Z])?)', which should
catch all destination specifications containing a specific
word.
If the regular expression contains `^FROM_DAEMON' it will be
substituted by `(^(Mailing-List:|Precedence:.*(junk|bulk
|list)|To: Multiple recipients of |(((Resent-)?(From|Sender)
|X-Envelope-From):|>?From )([^>]*[^(.%@a-z0-
9])?(Post(ma?(st(e?r)?|n)|office)|(send)?Mail(er)?|daemon
|m(mdf|ajordomo)|n?uucp|LIST(SERV|proc)|NETSERV|o(wner|ps)
|r(e(quest|sponse)|oot)|b(ounce|bs\.smtp)|echo|mirror
|s(erv(ices?|er)|mtp(error)?|ystem)|A(dmin(istrator)?|MMGR
|utoanswer))(([^).!:a-z0-9][-_a-z0-9]*)?[%@>\t
][^<)]*(\(.*\).*)?)?$([^>]|$)))', which should catch mails
coming from most daemons (how's that for a regular
expression :-).
If the regular expression contains `^FROM_MAILER' it will be
substituted by `(^(((Resent-)?(From|Sender)|X-Envelope-From):
|>?From )([^>]*[^(.%@a-z0-9])?(Post(ma(st(er)?|n)|office)
|(send)?Mail(er)?|daemon|mmdf|n?uucp|ops|r(esponse|oot)
|(bbs\.)?smtp(error)?|s(erv(ices?|er)|ystem)
|A(dmin(istrator)?|MMGR))(([^).!:a-z0-9][-_a-z0-9]*)?[%@>\t
][^<)]*(\(.*\).*)?)?$([^>]|$))' (a stripped down version of
`^FROM_DAEMON'), which should catch mails coming from most
mailer-daemons.
When assigning boolean values to variables like VERBOSE,
DELIVERED or COMSAT, procmail accepts as true every string
starting with: a non-zero value, `on', `y', `t' or `e'.
False is every string starting with: a zero value, `off',
`n', `f' or `d'.
If the action line of a recipe specifies a program, a sole
backslash-newline pair in it on an otherwise empty line will
be converted into a newline.
The regular expression engine built into procmail does not
support named character classes.
NOTES
Since unquoted leading whitespace is generally ignored in
the rcfile you can indent everything to taste.
The leading `|' on the action line to specify a program or
filter is stripped before checking for $SHELLMETAS.
Files included with the INCLUDERC directive containing only
environment variable assignments can be shared with sh.
The current behavior of assignments on the command line to
INCLUDERC and SWITCHRC is not guaranteed and may be changed
or removed in future releases.
For really complicated processing you can even consider cal-
ling procmail recursively.
In the old days, the `:0' that marks the beginning of a re-
cipe, had to be changed to `:n', whereby `n' denotes the
number of conditions that follow.
AUTHORS
Stephen R. van den Berg
<srb@cuci.nl>
Philip A. Guenther
<guenther@sendmail.com>
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