sieve filtering into a program, or a file?

[The Hermit Hacker]

Right now, we're using procmail in order to help a user filter mail ...
basically, if it comes in with a To address of X, file it to a file, else
file it into his imap mailbox ...

Is there some way of doing similar with sieve *or* at least having that
mail message pipe'd through a program?

thanks ...

Marc G. Fournier                   ICQ#7615664               IRC Nick: Scrappy
Systems Administrator @ hub.org
primary: [EMAIL PROTECTED]           secondary: scrappy@{freebsd|postgresql}.org