Ubuntu Manpage: sieve-filter - Pigeonhole's Sieve mailbox filter tool

Provided by: dovecot-sieve_2.3.21+dfsg1-2ubuntu6_amd64

NAME

       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.

SYNOPSIS

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

DESCRIPTION

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.

CAUTION
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:

MAKING A BACKUP IS IMPERATIVE FOR ANY IMPORTANT MAIL!

OPTIONS

-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.

-o setting=value
Overrides the configuration setting from /etc/dovecot/dovecot.conf and from the userdb with the
given value. In order to override multiple settings, the -o option may be specified multiple
times.

-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 THIS TO FEED MAIL TO SENDMAIL!.

-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. When omitted, the command will be executed with the
environment of the currently logged in 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.

ARGUMENTS

script-file
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.

source-mailbox
Specifies the source mailbox containing the messages that the Sieve filter will act upon.

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.

discard-action
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
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.

EXAMPLES

       [...]

EXIT STATUS

       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)

FILES

       /etc/dovecot/dovecot.conf
              Dovecot's main configuration file.

       /etc/dovecot/conf.d/90-sieve.conf
              Sieve interpreter settings (included from Dovecot's main configuration file)

REPORTING BUGS

       Report  bugs,  including  doveconf  -n  output,  to  the  Dovecot  Mailing  List   <dovecot@dovecot.org>.
       Information about reporting bugs is available at: http://dovecot.org/bugreport.html