Exiscan, Spamassassin, Cyrus and different Mailboxes for spam

Hi,

I am looking through the internet and books for a long time now and I am
really not sure, whats the best solution and where I can find
configuration examples.

Spamassassin is running fine and the exiscan module is setting different
X-Spam Headers.

Now I want to rewrite the recipient when the Spam Core is above 10,
those mails should be delivered to another mailbox.

I only found old procmail solutions (not using exiscan) but I am sure I
can do that within exim alone, without procmail.
I am absolutly not sure about using the right syntax, all trials are
ending up with syntax errors.

Have you any hints for me?

Thanks a lot!

Angelika