Procmail + Sieve ?

[Wodan]

Hi there Guys,

I'm using a setup of Exim, procmail and Cyrus2 together.

Now, exim recevies the mail, passes it to procmail via some kind of pipe 
and procmail uses cyrdeliver to put mails into the corredsponding cyrus 
imap mail folders ...

now is there a way to put sieve between procmail and cyrus ?
like make sieve filter all messages that procmail didn't ?

removing the target mailbox from the cyrdeliver command doesn't help. How 
do i pass mail to cyrus so that is still applys the sieve rules ?

thanks,
wodan