I want have dspam statistics to be per-user, not global. And I like idea to learn filter by moving messages from/to SPAM folder, it seems to be natural and much better, than Web UI (I don't want to use dspam Web UI at all).

Is here any way to resolve two problems:

(1) Run dspam in chrooted environment (2) pass `--user=${USER}' parameter to dspam.

No idea. Passing --user is easy, there's an example in the readme file for the antispam plugin. The former I have no idea about, I guess all it needs is access to the mysql db.

Oh, and even more: I think, that it will be useful to have socket' backend for spam-plugin, which allows to send messages to two different configured sockets (TCP or UNIX domain) -- one for learn as spam' and other for `learn as ham'. It allows to run in chrooted environment easily, and solve problem with exec-dspam-on-every-message.

Dunno. Why are you running it chrooted anyway? If you write such a backend I can add it to my tree :)

johannes