Provided by: procmail_3.22-19_amd64 bug

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 procmail), 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 program 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 continue 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
       appropriately 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 variables 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 additional 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 unsuccessful, 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 terminate 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  permitted.   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
              leading 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
       nonexistent) 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:/usr/local/bin:/usr/bin:/bin (Except during the processing
                             of an /etc/procmailrc file, when it will be set to `/usr/local/bin
                             :/usr/bin:/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 successfully opened rcfile starts with
                             `./' or if -m has been specified, in which case it defaults to `.')

       DEFAULT               $ORGMAIL

       MSGPREFIX             msg.

       SENDMAIL              /usr/sbin/sendmail

       SENDMAILFLAGS         -oi

       HOST                  The current hostname

       COMSAT                no
                             (If an rcfile is specified on the command line)

       PROCMAIL_VERSION      3.22

       LOCKEXT               .lock

       Other cleared or preset environment variables are IFS, ENV and PWD.

       For security reasons, upon startup procmail will wipe out all environment  variables  that
       are suspected of modifying the behavior of the runtime linker.

   Environment
       Before  you  get  lost in the multitude of environment variables, 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).  Procmail 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  diagnostic  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
                   variable 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 procmail 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 previous
                   one  will be removed before trying to create the new one.  The use of a global
                   lockfile is discouraged, whenever possible use locallockfiles (on a per recipe
                   basis) instead.

       LOCKEXT     Default  extension  that  is  appended to a destination 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  erroneously
                   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 useful 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 terminated; 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 maildir or an MH directory).

       HOST        If this is not the hostname of the machine, processing 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 executed 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 procmail 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 unavailable (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 of its own accord  and  not  because  it  received  a
                   signal, 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.   Possible  uses  for  TRAP are: removal of temporary files, logging
                   customised abstracts, etc.  See also EXITCODE and LOGABSTRACT.

       EXITCODE    By default, procmail returns an exitcode of zero (success) if it  successfully
                   delivered  the  message  or  if the HOST variable was misset and there were no
                   more rcfiles on the command line; otherwise it returns failure.  Before  doing
                   so,  procmail examines the value of this variable.  If it is set to a positive
                   numeric value, procmail will instead use that value as its exitcode.  If  this
                   variable  is  set but empty and TRAP is set, procmail will set the exitcode to
                   whatever the TRAP program returns.  If this variable is not set, procmail will
                   set it shortly before calling up the TRAP program.

       LASTFOLDER  This variable is assigned to by procmail whenever 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 whenever 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 directory) which will be included
                   here as if it were part of the current rcfile.  Nesting is permitted 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.  Command line assignments to INCLUDERC have no effect.

       SWITCHRC    Names an rcfile (relative to the current directory) to which  processing  will
                   be  switched.   If  the  named rcfile doesn't exist or is not a normal 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  processing  of  the
                   current  rcfile  as  if it had ended at the assignment.  As with INCLUDERC, no
                   checking is done on the permissions or ownership of  the  rcfile  and  command
                   line assignments have no effect.

       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  operation  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; in
       particular, the repetition operator { is not supported by procmail's egrep):

       ^         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 meaning.  See also $\ variable substitution.

       These were only samples, of course, any more complex combination is valid as well.

       The following token meanings are special procmail extensions:

       ^ 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
       continuation.  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
       according 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 broken 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), 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 substitution will never be split  on  whitespace.   When
       the  -a or -m options are used, $# will expand to the number of arguments so specified and
       "$@" (the quotes are required) will expand to the specified arguments.  However, "$@" will
       only  be  expanded  when  used  in  the argument list to a program, and then only one such
       occurrence will be expanded.

       Unquoted variable expansions performed by procmail are always 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 processing.  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 incorrect value.  The regexp can
       be made to work by removing one or more unneeded '*', '+', or '?' operator  on  the  left-
       hand side of the \/ token.

MISCELLANEOUS

       If the regular expression contains `^TO_' it will be substituted 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 substituted 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, has been changed once already, and may be changed again or removed  in  future
       releases.

       For really complicated processing you can even consider calling procmail recursively.

       In the old days, the `:0' that marks the beginning of a recipe, 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>