procmail rule to filter debian-user

Hey everyone,

I need a rule to filter debian-user into a seperate maildir. I know there's the header:
X-Maling-List: <debian-user...

so I tried:
* ^X-Mailing-List: <debian-user.*

and several variations, but none of them worked.

Thank in advance,

To UNSUBSCRIBE, email to debian-user-REQUEST@xxxxxxxxxxxxxxxx with a subject of "unsubscribe". Trouble? Contact listmaster@xxxxxxxxxxxxxxxx