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procmailrc (5)
  • >> procmailrc (5) ( Solaris man: Форматы файлов )
  • procmailrc (5) ( Linux man: Форматы файлов )
         procmailrc - procmail rcfile
         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.
         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.
         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
         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
         b    Feed the body to the pipe,  file  or  mail  destination
         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                  $HOME/bin:/bin:/usr/ucb :/usr/local/bin
                               (Except during the  processing  of  an
                               /etc/procmailrc  file, when it will be
                               set to  `/bin :/usr/ucb :/usr/local/bin
         SHELLMETAS            &|<>~;?*[
         SHELLFLAGS            -c
         ORGMAIL               /var/mail/$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.
         Before you get lost in the multitude  of  environment  vari-
         ables,  keep  in  mind  that  all  of  them  have reasonable
         MAILDIR     Current directory while  procmail  is  executing
                     (that  means  that  all  paths  are  relative to
         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
         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:
         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
         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 `\/'
         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.
                     The  version  number  of  the  running  procmail
                     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-
         ^ 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.
         Look in the procmailex(5) man page.
         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
         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.
         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)
         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
         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
         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-
         ][^<)]*(\(.*\).*)?)?$([^>]|$)))', 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)
         ][^<)]*(\(.*\).*)?)?$([^>]|$))' (a stripped down version of
         `^FROM_DAEMON'), which should catch mails coming from most
         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.
         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.
         Stephen R. van den Berg
         Philip A. Guenther

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