Site-wide Sieve script

[Sarwar Ansari]

Hello,

I am using spamassassin to to tag spam
and would like to file the spam in users
INBOX/Spam folder.

Is it possible to have a site-wide
sieve script which will filter all the
incoming mails, and be called before the
per user sieve scripts.

This would save users the hassle of
explicitly invoking the anti-spam sieve
script, to file spam when they first sign-in.

will appreciate insights  by sys admins already
using spamassassin to filter spam,
and file it in spam folder.

Regards

Sarwar Ansari