[Dovecot] "pipe" plugin

Hi,

Long ago (more than 2 month ago), I told about a "pipe" plugin I had written to perform some spam/ham learning (see the attached message). I'm now proud to say that I can make it available for use by anyone. You can get it from http://nicolas.boullis.free.fr/pipe.tar.gz

Note that this is a temporary location. If someone had a good place to host it, feel free to do (and tell).

I think it would be great if the feature could be merged into dovecot. I don't care whether my plugin is used or a rewrite is performed...

Cheers,

Nicolas