cyrus and global filtering

[Johannes Egger]

Dear list,

I run cyrus 2.1.18 and postfix 2.1.5 on a linux debian box, 2.6.8 kernel.
I use cyrdeliver as a delivery agent for postfix, procmail is not involved.

I am wondering whther it is possible to use global filtering scripts with cyrus,
similar to
/etc/procmailrc.

The reason I ask - maybe there are other ways to do this - is that I would like to
filter mails
tagged as spam by spamassassin into a user's "spam" folder, with a minimum of
maintenance (e.g.
I'd like to automatically create the folder and subscribe the user to it).

I have been told and read on the web that sieve scripts only work on a per-user
basis. My users
use the squirrelmail "avelsieve" plugin to modify filtering rules.

I have considered solving the problem using "plus addressing", e.g.
"user+spam at domain" but so far
I have not been successful.

Any help?

Thanks,

Johannes