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+Pigeonhole Sieve Plugins
+========================
+
+The Pigeonhole Sieve interpreter can be dynamically extended with new features
+by means of plugins. Plugins can be configured using the 'sieve_plugins'
+setting in the 'plugin' section of the Dovecot configuration, as explained on
+the <Pigeonhole Sieve Configuration page> [Pigeonhole.Sieve.Configuration.txt].
+
+The following plugins are currently available for the Pigeonhole Sieve
+interpeter:
+
+ * <Extdata> [Pigeonhole.Sieve.Plugins.Extdata.txt] /(custom language
+   extension, experimental)/
+ * This plugin adds support for the Dovecot-specific 'vnd.dovecot.extdata'
+   extension, which allows access to external string data. Any type of Dovecot
+   dict lookup can be specified as data source.
+ * <Extprograms> [Pigeonhole.Sieve.Plugins.Extprograms.txt] [*Pigeonhole v0.3*
+   and beyond]/(custom language extensions)/
+ * This plugin adds support for the Dovecot-specific 'vnd.dovecot.pipe',
+   'vnd.dovecot.filter' and 'vnd.dovecot.execute' extensions. These extensions
+   add new action commands for invoking a predefined set of external programs
+   (typically shell scripts. Messages can be piped to or filtered through those
+   programs and string data can be input to and retrieved from those programs.
+ * <IMAPSieve> [Pigeonhole.Sieve.Plugins.IMAPSieve.txt] [*Pigeonhole v0.4.14*
+   and beyond]/(standard language extension, RFC 6785
+   [https://tools.ietf.org/html/rfc6785])/
+ * This set of plugins adds support for the 'imapsieve' extension in sieve and
+   the 'IMAPSIEVE' capability in IMAP. With these plugins it is possible to use
+   Sieve filtering in IMAP, operating when messages are created or their
+   attributes are changed.
+ * <IMAP FILTER=SIEVE> [Pigeonhole.Sieve.Plugins.IMAPFilterSieve.txt]
+   [*Pigeonhole v0.4.24* and beyond, *Pigeonhole v0.5.2* and beyond] /(custom
+   language extension, experimental)/
+ * This plugin provides a vendor-defined IMAP extension called FILTER=SIEVE. It
+   adds a new FILTER command that allows applying a mail filter (a Sieve
+   script) on a set of messages that match the specified IMAP searching
+   criteria.
+ * <Pipe> [Pigeonhole.Sieve.Plugins.Pipe.txt] [*Pigeonhole v0.2*] /(custom
+   language extension, deprecated)/
+ * This plugin adds support for the Dovecot-specific 'vnd.dovecot.pipe'
+   extension, which allows piping messages to a pre-defined set of external
+   programs. For Pigeonhole v0.3, the same functionality (and more) is provided
+   by the extprograms plugin.
+
+(This file was created from the wiki on 2019-06-19 12:42)