[Dovecot] New plugin for Pigeonhole Sieve: sieve_pipe

[Stephan Bosch]

Hello,

I've finished up work on a new plugin for Pigeonhole Sieve: sieve_pipe. 
It adds a new Sieve extension (vnd.dovecot.pipe) providing a new action 
command that provides the possibility to pipe messages to external 
programs (e.g. shell scripts). The programs available to this command 
are explicitly limited and subject to administrator configuration.

The plugin can currently only be downloaded from the Mercurial repository:

http://hg.rename-it.nl/pigeonhole-0.2-sieve-pipe

Check the README/INSTALL files in the repository or the new wiki page 
for more information:

http://hg.rename-it.nl/pigeonhole-0.2-sieve-pipe/raw-file/tip/README
http://hg.rename-it.nl/pigeonhole-0.2-sieve-pipe/raw-file/tip/INSTALL
http://master.wiki2.dovecot.org/Pigeonhole/Sieve/Plugins/Pipe

The specification of the vnd.dovecot.pipe extension can be found here:

http://hg.rename-it.nl/pigeonhole-0.2-sieve-pipe/raw-file/tip/doc/rfc/spec-bosch-sieve-pipe.txt

I'd still call this thing very much experimental, so be sure to test it 
extensively first. Don't hesitate to notify me when there are any problems.

Regards,

Stephan.