Provided by: dovecot-sieve_2.2.22-1ubuntu2_amd64 bug


       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
       modified  or  moved to a different folder. Messages are never lost unless a discard-action
       argument 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
              explanation 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-filter 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 preserved.

       -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
              messages 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
              arguments  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
              configuration. 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
              parameter 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
                     useful  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
              specified 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-mailbox, 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
       <>.    Information   about   reporting   bugs    is    available    at:


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