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SIEVE-FILTER(1) 			    Pigeonhole				  SIEVE-FILTER(1)

       sieve-filter - Pigeonhole's Sieve mailbox filter tool

       WARNING:  This  tool  is  still	experimental.  Read this manual carefully, and backup any
       important mail before using this tool. Also note that some of the features documented here
       are not actually implemented yet; this is clearly indicated where applicable.

       sieve-filter [options] script-file source-mailbox [discard-action]

       The  sieve-filter  command  is  part of the Pigeonhole Project (pigeonhole(7)), which adds
       Sieve (RFC 5228) support to the Dovecot secure IMAP and POP3 server (dovecot(1)).

       The Sieve language was originally meant for filtering messages  upon  delivery.	 However,
       there  are  occasions when it is desirable to filter messages that are already stored in a
       mailbox, for instance when a bug in a Sieve script caused many messages	to  be	delivered
       incorrectly.  Using  the  sieve-filter  tool it is possible to apply a Sieve script on all
       messages in a particular source-mailbox, making it possible to delete messages,	to  store
       them  in  a  different  mailbox,  to change their content, and to change the assigned IMAP
       flags and keywords. Attempts to send messages to the outside world are ignored by  default
       for obvious reasons, but, using the proper command line options, it is possible to capture
       and handle outgoing mail as well.

       If no options are specified, the sieve-filter command runs in a simulation mode	in  which
       it only prints what would be performed, without actually doing anything. Use the -e option
       to activate true script	execution.  Also,  the	source-mailbox	is  opened  read-only  by
       default,  meaning  that	it  normally always remains unchanged. Use the -W option to allow
       changes in the source-mailbox.

       Even with the -W option enabled, messages in the source-mailbox are only potentially modi-
       fied or moved to a different folder. Messages are never lost unless a discard-action argu-
       ment other than keep (the default) is specified. If the Sieve filter decides to store  the
       message	in  the source-mailbox, where it obviously already exists, it is never duplicated
       there. In that case, the IMAP flags of the original message can be modified by  the  Sieve
       interpreter  using the imap4flags extension, provided that -W is specified. If the message
       itself is modified by the Sieve interpreter (e.g. using the editheader extension),  a  new
       message	is  stored  and  the old one is expunged. However, if -W is omitted, the original
       message is left untouched and the modifications are discarded.

       Although this is a very useful tool, it can also be very destructive when used improperly.
       A  small bug in your Sieve script in combination with the wrong command line options could
       cause it to discard the wrong e-mails. And,  even  if  the  source-mailbox  is  opened  in
       read-only  mode to prevent such mishaps, it can still litter other mailboxes with spurious
       copies of your e-mails if your Sieve script decides to do so. Therefore, users are advised
       to  read  this  manual  carefully  and  to use the simulation mode first to check what the
       script will do. And, of course:


       -c config-file
	      Alternative Dovecot configuration file path.

       -C     Force compilation. By default, the compiled binary is stored  on	disk.  When  this
	      binary is found during the next execution of sieve-filter and its modification time
	      is more recent than the script file, it is used and  the	script	is  not  compiled
	      again.  This  option  forces  the  script to be compiled, thus ignoring any present
	      binary. Refer to sievec(1) for more information about Sieve compilation.

       -D     Enable Sieve debugging.

       -e     Turns on execution mode. By default, the sieve-filter command  runs  in  simulation
	      mode in which it changes nothing, meaning that no mailbox is altered in any way and
	      no actions are performed. It only prints what would be done.   Using  this  option,
	      the sieve-filter command becomes active and performs the requested actions.

       -m default-mailbox
	      The  mailbox  where the (implicit) keep Sieve action stores messages. This is equal
	      to the source-mailbox by default. Specifying  a  different  folder  will	have  the
	      effect  of  moving (or copying if -W is omitted) all kept messages to the indicated
	      folder, instead of just leaving them in the source-mailbox. Refer to  the  explana-
	      tion of the source-mailbox argument for more information on mailbox naming.

       -q output-mailbox [not implemented yet]
	      Store outgoing e-mail into the indicated output-mailbox. By default, the sieve-fil-
	      ter command ignores Sieve actions such as redirect, reject,  vacation  and  notify,
	      but  using  this option outgoing messages can be appended to the indicated mailbox.
	      This option has no effect in simulation mode. Flags of redirected messages are  not

       -Q mail-command [not implemented yet]
	      Send  outgoing  e-mail  (e.g. as produced by redirect, reject and vacation) through
	      the specified program. By default, the sieve-filter command ignores  Sieve  actions
	      such  as redirect, reject, vacation and notify, but using this option outgoing mes-
	      sages can be fed to the stdin of an external shell  command.  This  option  has  no
	      effect  in  simulation  mode. Unless you really know what you are doing, DO NOT USE

       -s script-file [not implemented yet]
	      Specify additional scripts to be executed before the main script. Multiple -s argu-
	      ments  are allowed and the specified scripts are executed sequentially in the order
	      specified at the command line.

       -u user
	      Run the Sieve script for the given user.

       -v     Produce verbose output during filtering.

       -W     Enables write access to the source-mailbox. This	allows	(re)moving  the  messages
	      from  the  source-mailbox,  changing their contents, and changing the assigned IMAP
	      flags and keywords.

       -x extensions
	      Set the available extensions. The parameter is a space-separated list of the active
	      extensions.  By prepending the extension identifiers with + or -, extensions can be
	      included or excluded relative to the configured set of  active  extensions.  If  no
	      extensions  have	a + or - prefix, only those extensions that are explicitly listed
	      will be enabled. Unknown extensions are ignored and a warning is produced.

	      For example -x "+imapflags -enotify" will enable the deprecated imapflags extension
	      and disable the enotify extension. The rest of the active extensions depends on the
	      sieve_extensions and  sieve_global_extensions  settings.	By  default,  i.e.   when
	      sieve_extensions	and  sieve_global_extensions  remain  unconfigured, all supported
	      extensions are available, except for deprecated extensions or those that are  still
	      under development.

	      Specifies the Sieve script to (compile and) execute.

	      Note  that  this	tool looks for a pre-compiled binary file with a .svbin extension
	      and with basename and path identical to the specified script. Use the -C option  to
	      disable this behavior by forcing the script to be compiled into a new binary.

	      Specifies the source mailbox containing the messages that the Sieve filter will act

	      This is the name of a mailbox, as visible to IMAP clients, except in UTF-8  format.
	      The  hierarchy separator between a parent and child mailbox is commonly '/' or '.',
	      but this depends on your selected mailbox storage format and  namespace  configura-
	      tion. The mailbox names may also require a namespace prefix.

	      This mailbox is not modified unless the -W option is specified.

	      Specifies  what  is done with messages in the source-mailbox that where not kept or
	      otherwise stored by the Sieve script; i.e. those messages that  would  normally  be
	      discarded if the Sieve script were executed at delivery.	The discard-action param-
	      eter accepts one of the following values:

	      keep (default)
		     Keep discarded messages in source mailbox.

	      move mailbox
		     Move discarded messages to the indicated mailbox. This is for instance  use-
		     ful  to  move  messages  to a Trash mailbox. Refer to the explanation of the
		     source-mailbox argument for more information on mailbox naming.

	      delete Flag discarded messages as \DELETED.

		     Expunge discarded messages, meaning that these are removed irreversibly when
		     the tool finishes filtering.

	      When the -W option is not specified, the source-mailbox is immutable and the speci-
	      fied discard-action has no effect. This means that messages are at most copied to a
	      new location. In contrast, when the -W is specified, messages that are successfully
	      stored somewhere else by the Sieve script are always expunged from the source-mail-
	      box,  with  the  effect that these are thus moved to the new location. This happens
	      irrespective of the specified discard-action. Remember: only discarded messages are
	      affected by the specified discard-action.


       sieve-filter will exit with one of the following values:

       0   Sieve filter applied successfully. (EX_OK, EXIT_SUCCESS)

       1   Operation failed. This is returned for almost all failures.	(EXIT_FAILURE)

       64  Invalid parameter given. (EX_USAGE)

	      Dovecot's main configuration file.

	      Sieve interpreter settings (included from Dovecot's main configuration file)

       Report  bugs,  including  doveconf  -n  output, to the Dovecot Mailing List <dovecot@dove-
       cot.org>.  Information about reporting  Dovecot	and  Pigeonhole  bugs  is  available  at:

       dovecot(1), dovecot-lda(1), sieve-dump(1), sieve-test(1), sievec(1), pigeonhole(7)

Pigeonhole for Dovecot v2.2		    2013-05-09				  SIEVE-FILTER(1)
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